25507620 has 36 divisors (see below), whose sum is σ = 77373660. Its totient is φ = 6801984.

The previous prime is 25507613. The next prime is 25507627. The reversal of 25507620 is 2670552.

It is an interprime number because it is at equal distance from previous prime (25507613) and next prime (25507627).

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 18249984 = 2694^2 + 4272^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (25507627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70675 + ... + 71034.

Almost surely, 2^25507620 is an apocalyptic number.

25507620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25507620 is an abundant number, since it is smaller than the sum of its proper divisors (51866040).

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

25507620 is a wasteful number, since it uses less digits than its factorization.

25507620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141724 (or 141719 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 25507620 is about 5050.5069052522. The cubic root of 25507620 is about 294.3675813241.

The spelling of 25507620 in words is "twenty-five million, five hundred seven thousand, six hundred twenty".