81074239972 has 24 divisors (see below), whose sum is σ = 154981546272. Its totient is φ = 36803486400.

The previous prime is 81074239943. The next prime is 81074240029. The reversal of 81074239972 is 27993247018.

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, 1177158 + ... + 1244125.

It is an arithmetic number, because the mean of its divisors is an integer number (6457564428).

Almost surely, 2^81074239972 is an apocalyptic number.

It is an amenable number.

81074239972 is a deficient number, since it is larger than the sum of its proper divisors (73907306300).

81074239972 is a wasteful number, since it uses less digits than its factorization.

81074239972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422059 (or 2422057 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 81074239972 in words is "eighty-one billion, seventy-four million, two hundred thirty-nine thousand, nine hundred seventy-two".