91436988 has 12 divisors (see below), whose sum is σ = 213353000. Its totient is φ = 30478992.

The previous prime is 91436981. The next prime is 91437013. The reversal of 91436988 is 88963419.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91436981) 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 3 ways as a sum of consecutive naturals, for example, 3809863 + ... + 3809886.

Almost surely, 2^91436988 is an apocalyptic number.

It is an amenable number.

91436988 is an abundant number, since it is smaller than the sum of its proper divisors (121916012).

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

91436988 is a wasteful number, since it uses less digits than its factorization.

91436988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619756 (or 7619754 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 91436988 is about 9562.2689776015. The cubic root of 91436988 is about 450.5129755075.

The spelling of 91436988 in words is "ninety-one million, four hundred thirty-six thousand, nine hundred eighty-eight".