25557216 has 24 divisors (see below), whose sum is σ = 67087944. Its totient is φ = 8519040.

The previous prime is 25557157. The next prime is 25557229. The reversal of 25557216 is 61275552.

25557216 = T₂₆₉ + T₂₇₀ + ... + T₅₅₆.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133015 + ... + 133206.

It is an arithmetic number, because the mean of its divisors is an integer number (2795331).

Almost surely, 2^25557216 is an apocalyptic number.

It is an amenable number.

25557216 is an abundant number, since it is smaller than the sum of its proper divisors (41530728).

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

25557216 is a wasteful number, since it uses less digits than its factorization.

25557216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266234 (or 266226 counting only the distinct ones).

The product of its digits is 21000, while the sum is 33.

The square root of 25557216 is about 5055.4145230634. The cubic root of 25557216 is about 294.5582433377.

The spelling of 25557216 in words is "twenty-five million, five hundred fifty-seven thousand, two hundred sixteen".