91772404464 has 160 divisors (see below), whose sum is σ = 264231088128. Its totient is φ = 27256320000.

The previous prime is 91772404447. The next prime is 91772404483. The reversal of 91772404464 is 46440427719.

It is a super-2 number, since 2×91772404464² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7751029 + ... + 7762859.

Almost surely, 2^91772404464 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 91772404464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132115544064).

91772404464 is an abundant number, since it is smaller than the sum of its proper divisors (172458683664).

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

91772404464 is a wasteful number, since it uses less digits than its factorization.

91772404464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12287 (or 12281 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 48.

The spelling of 91772404464 in words is "ninety-one billion, seven hundred seventy-two million, four hundred four thousand, four hundred sixty-four".