25640252 has 48 divisors (see below), whose sum is σ = 51184224. Its totient is φ = 11136000.

The previous prime is 25640249. The next prime is 25640257. The reversal of 25640252 is 25204652.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109928 + ... + 110160.

It is an arithmetic number, because the mean of its divisors is an integer number (1066338).

Almost surely, 2^25640252 is an apocalyptic number.

25640252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

25640252 is a deficient number, since it is larger than the sum of its proper divisors (25543972).

25640252 is a wasteful number, since it uses less digits than its factorization.

25640252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25640252 is about 5063.6204439116. The cubic root of 25640252 is about 294.8769073735.

Subtracting from 25640252 its reverse (25204652), we obtain a square (435600 = 660²).

The spelling of 25640252 in words is "twenty-five million, six hundred forty thousand, two hundred fifty-two".