91906090 has 16 divisors (see below), whose sum is σ = 166735872. Its totient is φ = 36472464.

The previous prime is 91906057. The next prime is 91906123. The reversal of 91906090 is 9060919.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91906057) and next prime (91906123).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34914 + ... + 37453.

It is an arithmetic number, because the mean of its divisors is an integer number (10420992).

Almost surely, 2^91906090 is an apocalyptic number.

91906090 is a deficient number, since it is larger than the sum of its proper divisors (74829782).

91906090 is a wasteful number, since it uses less digits than its factorization.

91906090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72501.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 91906090 is about 9586.7663995739. The cubic root of 91906090 is about 451.2820886065.

The spelling of 91906090 in words is "ninety-one million, nine hundred six thousand, ninety".