91620075 has 12 divisors (see below), whose sum is σ = 151478648. Its totient is φ = 48864000.

The previous prime is 91620007. The next prime is 91620083. The reversal of 91620075 is 57002619.

It is not a de Polignac number, because 91620075 - 2⁷ = 91619947 is a prime.

It is a Duffinian 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, 610726 + ... + 610875.

Almost surely, 2^91620075 is an apocalyptic number.

91620075 is a deficient number, since it is larger than the sum of its proper divisors (59858573).

91620075 is a wasteful number, since it uses less digits than its factorization.

91620075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221614 (or 1221609 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 91620075 is about 9571.8375978701. The cubic root of 91620075 is about 450.8134668781.

The spelling of 91620075 in words is "ninety-one million, six hundred twenty thousand, seventy-five".