91025028980 has 12 divisors (see below), whose sum is σ = 191152560900. Its totient is φ = 36410011584.

The previous prime is 91025028979. The next prime is 91025029009. The reversal of 91025028980 is 8982052019.

It can be written as a sum of positive squares in 2 ways, for example, as 15788927716 + 75236101264 = 125654^2 + 274292^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2275625705 + ... + 2275625744.

It is an arithmetic number, because the mean of its divisors is an integer number (15929380075).

Almost surely, 2^91025028980 is an apocalyptic number.

It is an amenable number.

91025028980 is an abundant number, since it is smaller than the sum of its proper divisors (100127531920).

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

91025028980 is a wasteful number, since it uses less digits than its factorization.

91025028980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551251458 (or 4551251456 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 91025028980 in words is "ninety-one billion, twenty-five million, twenty-eight thousand, nine hundred eighty".