25515216 has 40 divisors (see below), whose sum is σ = 73239360. Its totient is φ = 8504928.

The previous prime is 25515209. The next prime is 25515221. The reversal of 25515216 is 61251552.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 25515216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29100 + ... + 29963.

It is an arithmetic number, because the mean of its divisors is an integer number (1830984).

Almost surely, 2^25515216 is an apocalyptic number.

It is an amenable number.

25515216 is an abundant number, since it is smaller than the sum of its proper divisors (47724144).

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

25515216 is a wasteful number, since it uses less digits than its factorization.

25515216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59080 (or 59068 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 25515216 is about 5051.2588529989. The cubic root of 25515216 is about 294.3967986616.

Adding to 25515216 its reverse (61251552), we get a palindrome (86766768).

The spelling of 25515216 in words is "twenty-five million, five hundred fifteen thousand, two hundred sixteen".