25645690 has 64 divisors (see below), whose sum is σ = 58351104. Its totient is φ = 7907328.

The previous prime is 25645679. The next prime is 25645721. The reversal of 25645690 is 9654652.

It is a super-2 number, since 2×25645690² = 1315402831152200, which contains 22 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 31 ways as a sum of consecutive naturals, for example, 26902 + ... + 27838.

It is an arithmetic number, because the mean of its divisors is an integer number (911736).

Almost surely, 2^25645690 is an apocalyptic number.

25645690 is an abundant number, since it is smaller than the sum of its proper divisors (32705414).

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

25645690 is a wasteful number, since it uses less digits than its factorization.

25645690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 25645690 is about 5064.1573830204. The cubic root of 25645690 is about 294.8977525569.

It can be divided in two parts, 25645 and 690, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 25645690 in words is "twenty-five million, six hundred forty-five thousand, six hundred ninety".