91624725 has 18 divisors (see below), whose sum is σ = 164110466. Its totient is φ = 48866400.

The previous prime is 91624723. The next prime is 91624739. The reversal of 91624725 is 52742619.

91624725 is a `hidden beast` number, since 9 + 1 + 624 + 7 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 269361 + 91355364 = 519^2 + 9558^2 .

It is not a de Polignac number, because 91624725 - 2¹ = 91624723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91624725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91624721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 203386 + ... + 203835.

Almost surely, 2^91624725 is an apocalyptic number.

It is an amenable number.

91624725 is a deficient number, since it is larger than the sum of its proper divisors (72485741).

91624725 is a wasteful number, since it uses less digits than its factorization.

91624725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407237 (or 407229 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 91624725 is about 9572.0804948559. The cubic root of 91624725 is about 450.8210934714.

The spelling of 91624725 in words is "ninety-one million, six hundred twenty-four thousand, seven hundred twenty-five".