25427640 has 64 divisors (see below), whose sum is σ = 87183360. Its totient is φ = 5811840.

The previous prime is 25427617. The next prime is 25427641. The reversal of 25427640 is 4672452.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25427598 and 25427607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25427641) 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, 14296 + ... + 15975.

It is an arithmetic number, because the mean of its divisors is an integer number (1362240).

Almost surely, 2^25427640 is an apocalyptic number.

25427640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25427640 is an abundant number, since it is smaller than the sum of its proper divisors (61755720).

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

25427640 is a wasteful number, since it uses less digits than its factorization.

25427640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30292 (or 30288 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 25427640 is about 5042.5826716079. The cubic root of 25427640 is about 294.0595927143.

The spelling of 25427640 in words is "twenty-five million, four hundred twenty-seven thousand, six hundred forty".