91639494 has 24 divisors (see below), whose sum is σ = 199021680. Its totient is φ = 30474288.

The previous prime is 91639481. The next prime is 91639501. The reversal of 91639494 is 49493619.

91639494 is a `hidden beast` number, since 9 + 1 + 639 + 4 + 9 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2104 + ... + 13700.

It is an arithmetic number, because the mean of its divisors is an integer number (8292570).

Almost surely, 2^91639494 is an apocalyptic number.

91639494 is an abundant number, since it is smaller than the sum of its proper divisors (107382186).

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

91639494 is a wasteful number, since it uses less digits than its factorization.

91639494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12044 (or 12041 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 91639494 is about 9572.8519261503. The cubic root of 91639494 is about 450.8453148047.

The spelling of 91639494 in words is "ninety-one million, six hundred thirty-nine thousand, four hundred ninety-four".