25615920 has 160 divisors (see below), whose sum is σ = 89708544. Its totient is φ = 5990400.

The previous prime is 25615901. The next prime is 25615927. The reversal of 25615920 is 2951652.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (25615927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81684 + ... + 81996.

Almost surely, 2^25615920 is an apocalyptic number.

25615920 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 25615920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44854272).

25615920 is an abundant number, since it is smaller than the sum of its proper divisors (64092624).

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

25615920 is a wasteful number, since it uses less digits than its factorization.

25615920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 25615920 is about 5061.2172448928. The cubic root of 25615920 is about 294.7836007538.

The spelling of 25615920 in words is "twenty-five million, six hundred fifteen thousand, nine hundred twenty".