25656720 has 40 divisors (see below), whose sum is σ = 79536576. Its totient is φ = 6841728.

The previous prime is 25656679. The next prime is 25656739. The reversal of 25656720 is 2765652.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×25656720³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53212 + ... + 53691.

Almost surely, 2^25656720 is an apocalyptic number.

25656720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25656720 is an abundant number, since it is smaller than the sum of its proper divisors (53879856).

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

25656720 is a wasteful number, since it uses less digits than its factorization.

25656720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106919 (or 106913 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 25656720 is about 5065.2462921362. The cubic root of 25656720 is about 294.9400241953.

The spelling of 25656720 in words is "twenty-five million, six hundred fifty-six thousand, seven hundred twenty".