91752138580 has 24 divisors (see below), whose sum is σ = 192710963592. Its totient is φ = 36694860672.

The previous prime is 91752138571. The next prime is 91752138581. The reversal of 91752138580 is 8583125719.

It can be written as a sum of positive squares in 4 ways, for example, as 1033108164 + 90719030416 = 32142^2 + 301196^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91752138581) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 248127 + ... + 495046.

It is an arithmetic number, because the mean of its divisors is an integer number (8029623483).

Almost surely, 2^91752138580 is an apocalyptic number.

It is an amenable number.

91752138580 is an abundant number, since it is smaller than the sum of its proper divisors (100958825012).

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

91752138580 is a wasteful number, since it uses less digits than its factorization.

91752138580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749355 (or 749353 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 91752138580 in words is "ninety-one billion, seven hundred fifty-two million, one hundred thirty-eight thousand, five hundred eighty".