91370711640 has 128 divisors (see below), whose sum is σ = 295657205760. Its totient is φ = 22456241664.

The previous prime is 91370711639. The next prime is 91370711669. The reversal of 91370711640 is 4611707319.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 964057 + ... + 1054583.

It is an arithmetic number, because the mean of its divisors is an integer number (2309821920).

Almost surely, 2^91370711640 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 91370711640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147828602880).

91370711640 is an abundant number, since it is smaller than the sum of its proper divisors (204286494120).

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

91370711640 is a wasteful number, since it uses less digits than its factorization.

91370711640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91201 (or 91197 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The spelling of 91370711640 in words is "ninety-one billion, three hundred seventy million, seven hundred eleven thousand, six hundred forty".