91669725 has 120 divisors (see below), whose sum is σ = 201653760. Its totient is φ = 40279680.

The previous prime is 91669723. The next prime is 91669741. The reversal of 91669725 is 52796619.

It is a happy number.

It is not a de Polignac number, because 91669725 - 2¹ = 91669723 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91669723) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 410964 + ... + 411186.

It is an arithmetic number, because the mean of its divisors is an integer number (1680448).

Almost surely, 2^91669725 is an apocalyptic number.

It is an amenable number.

91669725 is an abundant number, since it is smaller than the sum of its proper divisors (109984035).

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

91669725 is a wasteful number, since it uses less digits than its factorization.

91669725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 267 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 91669725 is about 9574.4307924806. The cubic root of 91669725 is about 450.8948858853.

The spelling of 91669725 in words is "ninety-one million, six hundred sixty-nine thousand, seven hundred twenty-five".