91987004516 has 24 divisors (see below), whose sum is σ = 179894766240. Its totient is φ = 40792462400.

The previous prime is 91987004503. The next prime is 91987004519. The reversal of 91987004516 is 61540078919.

It is not an unprimeable number, because it can be changed into a prime (91987004519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25493486 + ... + 25497093.

It is an arithmetic number, because the mean of its divisors is an integer number (7495615260).

Almost surely, 2^91987004516 is an apocalyptic number.

It is an amenable number.

91987004516 is a deficient number, since it is larger than the sum of its proper divisors (87907761724).

91987004516 is a wasteful number, since it uses less digits than its factorization.

91987004516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50990635 (or 50990633 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 91987004516 in words is "ninety-one billion, nine hundred eighty-seven million, four thousand, five hundred sixteen".