91668825 has 72 divisors (see below), whose sum is σ = 177384480. Its totient is φ = 45100800.

The previous prime is 91668821. The next prime is 91668827. The reversal of 91668825 is 52886619.

91668825 = T₃₁₁ + T₃₁₂ + ... + T₈₃₃.

It is not a de Polignac number, because 91668825 - 2² = 91668821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91668821) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 175014 + ... + 175536.

Almost surely, 2^91668825 is an apocalyptic number.

91668825 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91668825 is a deficient number, since it is larger than the sum of its proper divisors (85715655).

91668825 is a wasteful number, since it uses less digits than its factorization.

91668825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 591 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 91668825 is about 9574.3837921821. The cubic root of 91668825 is about 450.8934102738.

The spelling of 91668825 in words is "ninety-one million, six hundred sixty-eight thousand, eight hundred twenty-five".