81574883760 has 160 divisors (see below), whose sum is σ = 260264556288. Its totient is φ = 21124131840.

The previous prime is 81574883759. The next prime is 81574883773. The reversal of 81574883760 is 6738847518.

It is a self number, because there is not a number n which added to its sum of digits gives 81574883760.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1762515 + ... + 1808205.

Almost surely, 2^81574883760 is an apocalyptic number.

81574883760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81574883760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130132278144).

81574883760 is an abundant number, since it is smaller than the sum of its proper divisors (178689672528).

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

81574883760 is a wasteful number, since it uses less digits than its factorization.

81574883760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45923 (or 45917 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 57.

The spelling of 81574883760 in words is "eighty-one billion, five hundred seventy-four million, eight hundred eighty-three thousand, seven hundred sixty".