91869090 has 32 divisors (see below), whose sum is σ = 221654016. Its totient is φ = 24368640.

The previous prime is 91869083. The next prime is 91869097. The reversal of 91869090 is 9096819.

It is an interprime number because it is at equal distance from previous prime (91869083) and next prime (91869097).

It is not an unprimeable number, because it can be changed into a prime (91869097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2287 + ... + 13746.

It is an arithmetic number, because the mean of its divisors is an integer number (6926688).

Almost surely, 2^91869090 is an apocalyptic number.

91869090 is an abundant number, since it is smaller than the sum of its proper divisors (129784926).

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

91869090 is a wasteful number, since it uses less digits than its factorization.

91869090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16234.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 91869090 is about 9584.8364618287. The cubic root of 91869090 is about 451.2215206997.

The spelling of 91869090 in words is "ninety-one million, eight hundred sixty-nine thousand, ninety".