91726973664 has 48 divisors (see below), whose sum is σ = 253456116480. Its totient is φ = 28966412160.

The previous prime is 91726973633. The next prime is 91726973711. The reversal of 91726973664 is 46637962719.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×91726973664² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91726973598 and 91726973607.

It is a congruent number.

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, 25142632 + ... + 25146279.

It is an arithmetic number, because the mean of its divisors is an integer number (5280335760).

Almost surely, 2^91726973664 is an apocalyptic number.

It is an amenable number.

91726973664 is an abundant number, since it is smaller than the sum of its proper divisors (161729142816).

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

91726973664 is a wasteful number, since it uses less digits than its factorization.

91726973664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50288943 (or 50288935 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 60.

The spelling of 91726973664 in words is "ninety-one billion, seven hundred twenty-six million, nine hundred seventy-three thousand, six hundred sixty-four".