25515984 has 80 divisors (see below), whose sum is σ = 71856512. Its totient is φ = 7755264.

The previous prime is 25515983. The next prime is 25515991. The reversal of 25515984 is 48951552.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25515983) 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, 64074 + ... + 64470.

Almost surely, 2^25515984 is an apocalyptic number.

25515984 is a gapful number since it is divisible by the number (24) 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 25515984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35928256).

25515984 is an abundant number, since it is smaller than the sum of its proper divisors (46340528).

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

25515984 is a wasteful number, since it uses less digits than its factorization.

25515984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 518 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

The square root of 25515984 is about 5051.3348730806. The cubic root of 25515984 is about 294.3997523824.

The spelling of 25515984 in words is "twenty-five million, five hundred fifteen thousand, nine hundred eighty-four".