25480640 has 28 divisors (see below), whose sum is σ = 60676536. Its totient is φ = 10192128.

The previous prime is 25480633. The next prime is 25480643. The reversal of 25480640 is 4608452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25480643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39494 + ... + 40133.

Almost surely, 2^25480640 is an apocalyptic number.

25480640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25480640 is an abundant number, since it is smaller than the sum of its proper divisors (35195896).

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

25480640 is an equidigital number, since it uses as much as digits as its factorization.

25480640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79644 (or 79634 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 25480640 is about 5047.8351795596. The cubic root of 25480640 is about 294.2637582424.

The spelling of 25480640 in words is "twenty-five million, four hundred eighty thousand, six hundred forty".