25507540 has 24 divisors (see below), whose sum is σ = 53700192. Its totient is φ = 10177440.

The previous prime is 25507423. The next prime is 25507567. The reversal of 25507540 is 4570552.

It is a junction number, because it is equal to n+sod(n) for n = 25507499 and 25507508.

It is a congruent number.

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, 7975 + ... + 10705.

It is an arithmetic number, because the mean of its divisors is an integer number (2237508).

Almost surely, 2^25507540 is an apocalyptic number.

25507540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25507540 is an abundant number, since it is smaller than the sum of its proper divisors (28192652).

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

25507540 is a wasteful number, since it uses less digits than its factorization.

25507540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207 (or 3205 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 25507540 is about 5050.4989852489. The cubic root of 25507540 is about 294.3672735804.

The spelling of 25507540 in words is "twenty-five million, five hundred seven thousand, five hundred forty".