91987404 has 24 divisors (see below), whose sum is σ = 214980528. Its totient is φ = 30613440.

The previous prime is 91987403. The next prime is 91987409. The reversal of 91987404 is 40478919.

It is not an unprimeable number, because it can be changed into a prime (91987403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134 + ... + 13730.

It is an arithmetic number, because the mean of its divisors is an integer number (8957522).

Almost surely, 2^91987404 is an apocalyptic number.

It is an amenable number.

91987404 is an abundant number, since it is smaller than the sum of its proper divisors (122993124).

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

91987404 is a wasteful number, since it uses less digits than its factorization.

91987404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12265 (or 12263 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 91987404 is about 9591.0064122594. The cubic root of 91987404 is about 451.4151401266.

The spelling of 91987404 in words is "ninety-one million, nine hundred eighty-seven thousand, four hundred four".