91720373952 has 56 divisors (see below), whose sum is σ = 243237497776. Its totient is φ = 30502821888.

The previous prime is 91720373939. The next prime is 91720374019. The reversal of 91720373952 is 25937302719.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468493 + ... + 634764.

It is an arithmetic number, because the mean of its divisors is an integer number (4343526746).

Almost surely, 2^91720373952 is an apocalyptic number.

It is an amenable number.

91720373952 is an abundant number, since it is smaller than the sum of its proper divisors (151517123824).

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

91720373952 is a wasteful number, since it uses less digits than its factorization.

91720373952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103705 (or 1103695 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 48.

The spelling of 91720373952 in words is "ninety-one billion, seven hundred twenty million, three hundred seventy-three thousand, nine hundred fifty-two".