25790665 has 8 divisors (see below), whose sum is σ = 31785480. Its totient is φ = 20074752.

The previous prime is 25790663. The next prime is 25790693. The reversal of 25790665 is 56609752.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 24571849 = 1104^2 + 4957^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25790665 - 2¹ = 25790663 is a prime.

It is a super-2 number, since 2×25790665² = 1330316802284450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25790663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69520 + ... + 69889.

It is an arithmetic number, because the mean of its divisors is an integer number (3973185).

Almost surely, 2^25790665 is an apocalyptic number.

It is an amenable number.

25790665 is a deficient number, since it is larger than the sum of its proper divisors (5994815).

25790665 is a wasteful number, since it uses less digits than its factorization.

25790665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139451.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 25790665 is about 5078.4510433793. The cubic root of 25790665 is about 295.4523940743.

The spelling of 25790665 in words is "twenty-five million, seven hundred ninety thousand, six hundred sixty-five".