23640625 has 28 divisors (see below), whose sum is σ = 31640220. Its totient is φ = 17600000.

The previous prime is 23640613. The next prime is 23640637. The reversal of 23640625 is 52604632.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23640613) and next prime (23640637).

It can be written as a sum of positive squares in 14 ways, for example, as 19280881 + 4359744 = 4391^2 + 2088^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23640625 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23640593 and 23640602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 265581 + ... + 265669.

Almost surely, 2^23640625 is an apocalyptic number.

23640625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23640625 is a deficient number, since it is larger than the sum of its proper divisors (7999595).

23640625 is an frugal number, since it uses more digits than its factorization.

23640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 23640625 is about 4862.1625846942. The cubic root of 23640625 is about 287.0029217815.

The spelling of 23640625 in words is "twenty-three million, six hundred forty thousand, six hundred twenty-five".