25646540 has 24 divisors (see below), whose sum is σ = 57026592. Its totient is φ = 9655040.

The previous prime is 25646531. The next prime is 25646563. The reversal of 25646540 is 4564652.

It is a junction number, because it is equal to n+sod(n) for n = 25646497 and 25646506.

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 7 ways as a sum of consecutive naturals, for example, 37376 + ... + 38055.

It is an arithmetic number, because the mean of its divisors is an integer number (2376108).

Almost surely, 2^25646540 is an apocalyptic number.

25646540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25646540 is an abundant number, since it is smaller than the sum of its proper divisors (31380052).

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

25646540 is a wasteful number, since it uses less digits than its factorization.

25646540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75457 (or 75455 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 25646540 is about 5064.2413054672. The cubic root of 25646540 is about 294.9010105484.

The spelling of 25646540 in words is "twenty-five million, six hundred forty-six thousand, five hundred forty".