91038088 has 8 divisors (see below), whose sum is σ = 170696430. Its totient is φ = 45519040.

The previous prime is 91038053. The next prime is 91038109. The reversal of 91038088 is 88083019.

It can be written as a sum of positive squares in only one way, i.e., 89832484 + 1205604 = 9478^2 + 1098^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5689873 + ... + 5689888.

Almost surely, 2^91038088 is an apocalyptic number.

It is an amenable number.

91038088 is a deficient number, since it is larger than the sum of its proper divisors (79658342).

91038088 is a wasteful number, since it uses less digits than its factorization.

91038088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11379767 (or 11379763 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 91038088 is about 9541.3881589630. The cubic root of 91038088 is about 449.8568894718.

The spelling of 91038088 in words is "ninety-one million, thirty-eight thousand, eighty-eight".