25137640 has 32 divisors (see below), whose sum is σ = 61702560. Its totient is φ = 9140800.

The previous prime is 25137613. The next prime is 25137653. The reversal of 25137640 is 4673152.

It is a junction number, because it is equal to n+sod(n) for n = 25137599 and 25137608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28126 + ... + 29005.

It is an arithmetic number, because the mean of its divisors is an integer number (1928205).

Almost surely, 2^25137640 is an apocalyptic number.

25137640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25137640 is an abundant number, since it is smaller than the sum of its proper divisors (36564920).

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

25137640 is a wasteful number, since it uses less digits than its factorization.

25137640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57153 (or 57149 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 25137640 is about 5013.7451072028. The cubic root of 25137640 is about 292.9374077606.

It can be divided in two parts, 2513 and 7640, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 25137640 in words is "twenty-five million, one hundred thirty-seven thousand, six hundred forty".