621057252 has 12 divisors (see below), whose sum is σ = 1449133616. Its totient is φ = 207019080.

The previous prime is 621057223. The next prime is 621057253. The reversal of 621057252 is 252750126.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×621057252² = 771424220523583008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621057253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25877374 + ... + 25877397.

Almost surely, 2^621057252 is an apocalyptic number.

It is an amenable number.

621057252 is an abundant number, since it is smaller than the sum of its proper divisors (828076364).

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

621057252 is a wasteful number, since it uses less digits than its factorization.

621057252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51754778 (or 51754776 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 621057252 is about 24921.0202840895. The cubic root of 621057252 is about 853.1863116800.

The spelling of 621057252 in words is "six hundred twenty-one million, fifty-seven thousand, two hundred fifty-two".