25662440 has 32 divisors (see below), whose sum is σ = 57970080. Its totient is φ = 10224192.

The previous prime is 25662431. The next prime is 25662467. The reversal of 25662440 is 4426652.

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, 10187 + ... + 12453.

It is an arithmetic number, because the mean of its divisors is an integer number (1811565).

Almost surely, 2^25662440 is an apocalyptic number.

25662440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25662440 is an abundant number, since it is smaller than the sum of its proper divisors (32307640).

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

25662440 is a wasteful number, since it uses less digits than its factorization.

25662440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 25662440 is about 5065.8108926410. The cubic root of 25662440 is about 294.9619408911.

The spelling of 25662440 in words is "twenty-five million, six hundred sixty-two thousand, four hundred forty".