25815552 has 120 divisors (see below), whose sum is σ = 80235936. Its totient is φ = 7375872.

The previous prime is 25815551. The next prime is 25815553. The reversal of 25815552 is 25551852.

It is an interprime number because it is at equal distance from previous prime (25815551) and next prime (25815553).

It is not an unprimeable number, because it can be changed into a prime (25815551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3687933 + ... + 3687939.

Almost surely, 2^25815552 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 25815552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40117968).

25815552 is an abundant number, since it is smaller than the sum of its proper divisors (54420384).

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

25815552 is an frugal number, since it uses more digits than its factorization.

25815552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 12 counting only the distinct ones).

The product of its digits is 20000, while the sum is 33.

The square root of 25815552 is about 5080.9007075518. The cubic root of 25815552 is about 295.5473969226.

The spelling of 25815552 in words is "twenty-five million, eight hundred fifteen thousand, five hundred fifty-two".