81268037376 has 72 divisors (see below), whose sum is σ = 218313131904. Its totient is φ = 26836147200.

The previous prime is 81268037339. The next prime is 81268037401. The reversal of 81268037376 is 67373086218.

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, 412300 + ... + 576651.

It is an arithmetic number, because the mean of its divisors is an integer number (3032126832).

Almost surely, 2^81268037376 is an apocalyptic number.

It is an amenable number.

81268037376 is an abundant number, since it is smaller than the sum of its proper divisors (137045094528).

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

81268037376 is a wasteful number, since it uses less digits than its factorization.

81268037376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989077 (or 989063 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 81268037376 in words is "eighty-one billion, two hundred sixty-eight million, thirty-seven thousand, three hundred seventy-six".