81015287952 has 80 divisors (see below), whose sum is σ = 223467982848. Its totient is φ = 25230226560.

The previous prime is 81015287939. The next prime is 81015287993. The reversal of 81015287952 is 25978251018.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 805824 + ... + 900767.

Almost surely, 2^81015287952 is an apocalyptic number.

It is an amenable number.

81015287952 is an abundant number, since it is smaller than the sum of its proper divisors (142452694896).

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

81015287952 is a wasteful number, since it uses less digits than its factorization.

81015287952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706668 (or 1706662 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 81015287952 in words is "eighty-one billion, fifteen million, two hundred eighty-seven thousand, nine hundred fifty-two".