638926053930 has 24 divisors (see below), whose sum is σ = 1661207740452. Its totient is φ = 170380281024.

The previous prime is 638926053929. The next prime is 638926053937. The reversal of 638926053930 is 39350629836.

638926053930 is a `hidden beast` number, since 6 + 3 + 89 + 26 + 0 + 539 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 568469252961 + 70456800969 = 753969^2 + 265437^2 .

It is a super-2 number, since 2×638926053930² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638926053937) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3549589099 + ... + 3549589278.

Almost surely, 2^638926053930 is an apocalyptic number.

638926053930 is an abundant number, since it is smaller than the sum of its proper divisors (1022281686522).

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

638926053930 is a wasteful number, since it uses less digits than its factorization.

638926053930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7099178390 (or 7099178387 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 54.

The spelling of 638926053930 in words is "six hundred thirty-eight billion, nine hundred twenty-six million, fifty-three thousand, nine hundred thirty".