23640725 has 6 divisors (see below), whose sum is σ = 29314530. Its totient is φ = 18912560.

The previous prime is 23640691. The next prime is 23640737. The reversal of 23640725 is 52704632.

It can be written as a sum of positive squares in 3 ways, for example, as 1681 + 23639044 = 41^2 + 4862^2 .

It is not a de Polignac number, because 23640725 - 2²² = 19446421 is a prime.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 472790 + ... + 472839.

It is an arithmetic number, because the mean of its divisors is an integer number (4885755).

Almost surely, 2^23640725 is an apocalyptic number.

23640725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23640725 is a deficient number, since it is larger than the sum of its proper divisors (5673805).

23640725 is an equidigital number, since it uses as much as digits as its factorization.

23640725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945639 (or 945634 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 23640725 is about 4862.1728681732. The cubic root of 23640725 is about 287.0033264556.

The spelling of 23640725 in words is "twenty-three million, six hundred forty thousand, seven hundred twenty-five".