81724290704 has 40 divisors (see below), whose sum is σ = 182385850368. Its totient is φ = 34748904960.

The previous prime is 81724290701. The next prime is 81724290727. The reversal of 81724290704 is 40709242718.

It is not an unprimeable number, because it can be changed into a prime (81724290701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2858537 + ... + 2886984.

Almost surely, 2^81724290704 is an apocalyptic number.

It is an amenable number.

81724290704 is an abundant number, since it is smaller than the sum of its proper divisors (100661559664).

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

81724290704 is a wasteful number, since it uses less digits than its factorization.

81724290704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5745663 (or 5745657 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 81724290704 in words is "eighty-one billion, seven hundred twenty-four million, two hundred ninety thousand, seven hundred four".