25120864 has 36 divisors (see below), whose sum is σ = 50800932. Its totient is φ = 12227840.

The previous prime is 25120861. The next prime is 25120867. The reversal of 25120864 is 46802152.

It is an interprime number because it is at equal distance from previous prime (25120861) and next prime (25120867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25120861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53559 + ... + 54025.

It is an arithmetic number, because the mean of its divisors is an integer number (1411137).

Almost surely, 2^25120864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25120864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25400466).

25120864 is an abundant number, since it is smaller than the sum of its proper divisors (25680068).

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

25120864 is an equidigital number, since it uses as much as digits as its factorization.

25120864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25120864 is about 5012.0718270990. The cubic root of 25120864 is about 292.8722277944.

It can be divided in two parts, 251 and 20864, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 25120864 in words is "twenty-five million, one hundred twenty thousand, eight hundred sixty-four".