81200880528 has 40 divisors (see below), whose sum is σ = 222108293088. Its totient is φ = 25474785792.

The previous prime is 81200880503. The next prime is 81200880529. The reversal of 81200880528 is 82508800218.

It is a self number, because there is not a number n which added to its sum of digits gives 81200880528.

It is not an unprimeable number, because it can be changed into a prime (81200880529) 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, 49754626 + ... + 49756257.

Almost surely, 2^81200880528 is an apocalyptic number.

It is an amenable number.

81200880528 is an abundant number, since it is smaller than the sum of its proper divisors (140907412560).

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

81200880528 is a wasteful number, since it uses less digits than its factorization.

81200880528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99510911 (or 99510905 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 42.

The spelling of 81200880528 in words is "eighty-one billion, two hundred million, eight hundred eighty thousand, five hundred twenty-eight".