81574883720 has 32 divisors (see below), whose sum is σ = 200229261120. Its totient is φ = 29663593920.

The previous prime is 81574883711. The next prime is 81574883723. The reversal of 81574883720 is 2738847518.

It is not an unprimeable number, because it can be changed into a prime (81574883723) 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, 92698292 + ... + 92699171.

It is an arithmetic number, because the mean of its divisors is an integer number (6257164410).

Almost surely, 2^81574883720 is an apocalyptic number.

It is an amenable number.

81574883720 is an abundant number, since it is smaller than the sum of its proper divisors (118654377400).

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

81574883720 is a wasteful number, since it uses less digits than its factorization.

81574883720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185397485 (or 185397481 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 53.

The spelling of 81574883720 in words is "eighty-one billion, five hundred seventy-four million, eight hundred eighty-three thousand, seven hundred twenty".