638826761027 has 32 divisors (see below), whose sum is σ = 795955410432. Its totient is φ = 499233176064.

The previous prime is 638826761021. The next prime is 638826761047. The reversal of 638826761027 is 720167628836.

It is not a de Polignac number, because 638826761027 - 2¹⁰ = 638826760003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638826761021) 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 31 ways as a sum of consecutive naturals, for example, 3184028 + ... + 3378710.

It is an arithmetic number, because the mean of its divisors is an integer number (24873606576).

Almost surely, 2^638826761027 is an apocalyptic number.

638826761027 is a deficient number, since it is larger than the sum of its proper divisors (157128649405).

638826761027 is a wasteful number, since it uses less digits than its factorization.

638826761027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195147.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 638826761027 in words is "six hundred thirty-eight billion, eight hundred twenty-six million, seven hundred sixty-one thousand, twenty-seven".