91638742 has 8 divisors (see below), whose sum is σ = 148031856. Its totient is φ = 42294792.

The previous prime is 91638737. The next prime is 91638769. The reversal of 91638742 is 24783619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 91638695 and 91638704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762258 + ... + 1762309.

It is an arithmetic number, because the mean of its divisors is an integer number (18503982).

Almost surely, 2^91638742 is an apocalyptic number.

91638742 is a deficient number, since it is larger than the sum of its proper divisors (56393114).

91638742 is a wasteful number, since it uses less digits than its factorization.

91638742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3524582.

The product of its digits is 72576, while the sum is 40.

The square root of 91638742 is about 9572.8126483286. The cubic root of 91638742 is about 450.8440815788.

The spelling of 91638742 in words is "ninety-one million, six hundred thirty-eight thousand, seven hundred forty-two".