621306355140 has 144 divisors (see below), whose sum is σ = 1931044555440. Its totient is φ = 161603112960.

The previous prime is 621306355133. The next prime is 621306355183. The reversal of 621306355140 is 41553603126.

621306355140 is a `hidden beast` number, since 6 + 2 + 1 + 3 + 0 + 63 + 551 + 40 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 224829602244 + 396476752896 = 474162^2 + 629664^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 621306355095 and 621306355104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47144232 + ... + 47157408.

It is an arithmetic number, because the mean of its divisors is an integer number (13410031635).

Almost surely, 2^621306355140 is an apocalyptic number.

621306355140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621306355140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965522277720).

621306355140 is an abundant number, since it is smaller than the sum of its proper divisors (1309738200300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621306355140 is a wasteful number, since it uses less digits than its factorization.

621306355140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19622 (or 19617 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 621306355140 its reverse (41553603126), we get a palindrome (662859958266).

The spelling of 621306355140 in words is "six hundred twenty-one billion, three hundred six million, three hundred fifty-five thousand, one hundred forty".