25506864 has 30 divisors (see below), whose sum is σ = 71384196. Its totient is φ = 8502240.

The previous prime is 25506847. The next prime is 25506881. The reversal of 25506864 is 46860552.

It is an interprime number because it is at equal distance from previous prime (25506847) and next prime (25506881).

It is a super-2 number, since 2×25506864² = 1301200222228992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88422 + ... + 88709.

Almost surely, 2^25506864 is an apocalyptic number.

25506864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25506864 is an abundant number, since it is smaller than the sum of its proper divisors (45877332).

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

25506864 is a wasteful number, since it uses less digits than its factorization.

25506864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177145 (or 177136 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 25506864 is about 5050.4320607251. The cubic root of 25506864 is about 294.3646731201.

The spelling of 25506864 in words is "twenty-five million, five hundred six thousand, eight hundred sixty-four".