621338056 has 8 divisors (see below), whose sum is σ = 1165008870. Its totient is φ = 310669024.

The previous prime is 621338051. The next prime is 621338087. The reversal of 621338056 is 650833126.

It can be written as a sum of positive squares in only one way, i.e., 598585156 + 22752900 = 24466^2 + 4770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (621338051) 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 as a sum of consecutive naturals, namely, 38833621 + ... + 38833636.

Almost surely, 2^621338056 is an apocalyptic number.

It is an amenable number.

621338056 is a deficient number, since it is larger than the sum of its proper divisors (543670814).

621338056 is a wasteful number, since it uses less digits than its factorization.

621338056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77667263 (or 77667259 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 621338056 is about 24926.6535258947. The cubic root of 621338056 is about 853.3148784800.

The spelling of 621338056 in words is "six hundred twenty-one million, three hundred thirty-eight thousand, fifty-six".