8031640638 has 16 divisors (see below), whose sum is σ = 18358035840. Its totient is φ = 2294754456.

The previous prime is 8031640627. The next prime is 8031640681. The reversal of 8031640638 is 8360461308.

It is a junction number, because it is equal to n+sod(n) for n = 8031640596 and 8031640605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95614728 + ... + 95614811.

It is an arithmetic number, because the mean of its divisors is an integer number (1147377240).

Almost surely, 2^8031640638 is an apocalyptic number.

8031640638 is an abundant number, since it is smaller than the sum of its proper divisors (10326395202).

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

8031640638 is a wasteful number, since it uses less digits than its factorization.

8031640638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191229551.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 8031640638 is about 89619.4210983311. The cubic root of 8031640638 is about 2002.6332513055.

The spelling of 8031640638 in words is "eight billion, thirty-one million, six hundred forty thousand, six hundred thirty-eight".