25642780 has 24 divisors (see below), whose sum is σ = 56684880. Its totient is φ = 9717120.

The previous prime is 25642759. The next prime is 25642781. The reversal of 25642780 is 8724652.

It is a super-2 number, since 2×25642780² = 1315104332256800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33361 + ... + 34120.

It is an arithmetic number, because the mean of its divisors is an integer number (2361870).

Almost surely, 2^25642780 is an apocalyptic number.

25642780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25642780 is an abundant number, since it is smaller than the sum of its proper divisors (31042100).

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

25642780 is a wasteful number, since it uses less digits than its factorization.

25642780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67509 (or 67507 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 25642780 is about 5063.8700615241. The cubic root of 25642780 is about 294.8865981821.

The spelling of 25642780 in words is "twenty-five million, six hundred forty-two thousand, seven hundred eighty".