621100872 has 240 divisors, whose sum is σ = 2092273920. Its totient is φ = 171460800.

The previous prime is 621100849. The next prime is 621100873. The reversal of 621100872 is 278001126.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (621100873) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 983997 + ... + 984627.

It is an arithmetic number, because the mean of its divisors is an integer number (8717808).

Almost surely, 2^621100872 is an apocalyptic number.

621100872 is a gapful number since it is divisible by the number (62) 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 621100872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046136960).

621100872 is an abundant number, since it is smaller than the sum of its proper divisors (1471173048).

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

621100872 is a wasteful number, since it uses less digits than its factorization.

621100872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 621100872 is about 24921.8954335339. The cubic root of 621100872 is about 853.2062857460.

Adding to 621100872 its reverse (278001126), we get a palindrome (899101998).

The spelling of 621100872 in words is "six hundred twenty-one million, one hundred thousand, eight hundred seventy-two".