25159640 has 64 divisors (see below), whose sum is σ = 62277120. Its totient is φ = 9072000.

The previous prime is 25159619. The next prime is 25159649. The reversal of 25159640 is 4695152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25159597 and 25159606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25159649) 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, 92705 + ... + 92975.

It is an arithmetic number, because the mean of its divisors is an integer number (973080).

Almost surely, 2^25159640 is an apocalyptic number.

25159640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25159640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31138560).

25159640 is an abundant number, since it is smaller than the sum of its proper divisors (37117480).

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

25159640 is a wasteful number, since it uses less digits than its factorization.

25159640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 25159640 is about 5015.9385961154. The cubic root of 25159640 is about 293.0228406521.

The spelling of 25159640 in words is "twenty-five million, one hundred fifty-nine thousand, six hundred forty".