25629440 has 36 divisors (see below), whose sum is σ = 61393584. Its totient is φ = 10251264.

The previous prime is 25629407. The next prime is 25629473. The reversal of 25629440 is 4492652.

It is an interprime number because it is at equal distance from previous prime (25629407) and next prime (25629473).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 25629397 and 25629406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8732 + ... + 11291.

Almost surely, 2^25629440 is an apocalyptic number.

25629440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25629440 is an abundant number, since it is smaller than the sum of its proper divisors (35764144).

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

25629440 is an equidigital number, since it uses as much as digits as its factorization.

25629440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044 (or 20030 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 25629440 is about 5062.5527157749. The cubic root of 25629440 is about 294.8354535770.

The spelling of 25629440 in words is "twenty-five million, six hundred twenty-nine thousand, four hundred forty".