621667440 has 160 divisors (see below), whose sum is σ = 2149416000. Its totient is φ = 165150720.

The previous prime is 621667411. The next prime is 621667463. The reversal of 621667440 is 44766126.

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 = 621667395 and 621667404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 969520 + ... + 970160.

It is an arithmetic number, because the mean of its divisors is an integer number (13433850).

Almost surely, 2^621667440 is an apocalyptic number.

621667440 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 621667440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074708000).

621667440 is an abundant number, since it is smaller than the sum of its proper divisors (1527748560).

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

621667440 is a wasteful number, since it uses less digits than its factorization.

621667440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 621667440 is about 24933.2597146863. The cubic root of 621667440 is about 853.4656383941.

The spelling of 621667440 in words is "six hundred twenty-one million, six hundred sixty-seven thousand, four hundred forty".