25664890 has 8 divisors (see below), whose sum is σ = 46196820. Its totient is φ = 10265952.

The previous prime is 25664887. The next prime is 25664923. The reversal of 25664890 is 9846652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23512801 + 2152089 = 4849^2 + 1467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1283235 + ... + 1283254.

Almost surely, 2^25664890 is an apocalyptic number.

25664890 is a deficient number, since it is larger than the sum of its proper divisors (20531930).

25664890 is a wasteful number, since it uses less digits than its factorization.

25664890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566496.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 25664890 is about 5066.0527040290. The cubic root of 25664890 is about 294.9713272908.

The spelling of 25664890 in words is "twenty-five million, six hundred sixty-four thousand, eight hundred ninety".