91253937840 has 160 divisors (see below), whose sum is σ = 304807157760. Its totient is φ = 22450756608.

The previous prime is 91253937809. The next prime is 91253937847. The reversal of 91253937840 is 4873935219.

It is not an unprimeable number, because it can be changed into a prime (91253937847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6979149 + ... + 6992211.

It is an arithmetic number, because the mean of its divisors is an integer number (1905044736).

Almost surely, 2^91253937840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91253937840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152403578880).

91253937840 is an abundant number, since it is smaller than the sum of its proper divisors (213553219920).

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

91253937840 is a wasteful number, since it uses less digits than its factorization.

91253937840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15331 (or 15325 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 91253937840 in words is "ninety-one billion, two hundred fifty-three million, nine hundred thirty-seven thousand, eight hundred forty".