91638654 has 16 divisors (see below), whose sum is σ = 183524880. Its totient is φ = 30504960.

The previous prime is 91638629. The next prime is 91638661. The reversal of 91638654 is 45683619.

It is a congruent number.

It is an unprimeable number.

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, 5317 + ... + 14544.

It is an arithmetic number, because the mean of its divisors is an integer number (11470305).

Almost surely, 2^91638654 is an apocalyptic number.

91638654 is an abundant number, since it is smaller than the sum of its proper divisors (91886226).

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

91638654 is a wasteful number, since it uses less digits than its factorization.

91638654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20635.

The product of its digits is 155520, while the sum is 42.

The square root of 91638654 is about 9572.8080519772. The cubic root of 91638654 is about 450.8439372647.

The spelling of 91638654 in words is "ninety-one million, six hundred thirty-eight thousand, six hundred fifty-four".