91219872764 has 6 divisors (see below), whose sum is σ = 159634777344. Its totient is φ = 45609936380.

The previous prime is 91219872677. The next prime is 91219872769. The reversal of 91219872764 is 46727891219.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91219872769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11402484092 + ... + 11402484099.

It is an arithmetic number, because the mean of its divisors is an integer number (26605796224).

Almost surely, 2^91219872764 is an apocalyptic number.

It is an amenable number.

91219872764 is a deficient number, since it is larger than the sum of its proper divisors (68414904580).

91219872764 is a wasteful number, since it uses less digits than its factorization.

91219872764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22804968195 (or 22804968193 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The spelling of 91219872764 in words is "ninety-one billion, two hundred nineteen million, eight hundred seventy-two thousand, seven hundred sixty-four".