91973532672 has 352 divisors, whose sum is σ = 315189527040. Its totient is φ = 26273673216.

The previous prime is 91973532643. The next prime is 91973532697. The reversal of 91973532672 is 27623537919.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 15673483 + ... + 15679349.

Almost surely, 2^91973532672 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 91973532672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157594763520).

91973532672 is an abundant number, since it is smaller than the sum of its proper divisors (223215994368).

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

91973532672 is an frugal number, since it uses more digits than its factorization.

91973532672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5915 (or 5879 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 54.

The spelling of 91973532672 in words is "ninety-one billion, nine hundred seventy-three million, five hundred thirty-two thousand, six hundred seventy-two".