91307259840 has 224 divisors, whose sum is σ = 292888318464. Its totient is φ = 24098918400.

The previous prime is 91307259809. The next prime is 91307259851. The reversal of 91307259840 is 4895270319.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 91307259840.

It is a congruent number.

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, 45951327 + ... + 45953313.

It is an arithmetic number, because the mean of its divisors is an integer number (1307537136).

Almost surely, 2^91307259840 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 91307259840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146444159232).

91307259840 is an abundant number, since it is smaller than the sum of its proper divisors (201581058624).

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

91307259840 is a wasteful number, since it uses less digits than its factorization.

91307259840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475 (or 2465 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 91307259840 in words is "ninety-one billion, three hundred seven million, two hundred fifty-nine thousand, eight hundred forty".