15875640438 has 32 divisors (see below), whose sum is σ = 37027737600. Its totient is φ = 4535896680.

The previous prime is 15875640427. The next prime is 15875640457. The reversal of 15875640438 is 83404657851.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3854998 + ... + 3859113.

It is an arithmetic number, because the mean of its divisors is an integer number (1157116800).

Almost surely, 2^15875640438 is an apocalyptic number.

15875640438 is an abundant number, since it is smaller than the sum of its proper divisors (21152097162).

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

15875640438 is an equidigital number, since it uses as much as digits as its factorization.

15875640438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7714137 (or 7714123 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 15875640438 in words is "fifteen billion, eight hundred seventy-five million, six hundred forty thousand, four hundred thirty-eight".