25664765 has 16 divisors (see below), whose sum is σ = 36018048. Its totient is φ = 17188416.

The previous prime is 25664761. The next prime is 25664767. The reversal of 25664765 is 56746652.

25664765 = T₁₀₇₁ + T₁₀₇₂ + ... + T₁₁₁₃.

It is not a de Polignac number, because 25664765 - 2² = 25664761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7022 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (2251128).

Almost surely, 2^25664765 is an apocalyptic number.

It is an amenable number.

25664765 is a deficient number, since it is larger than the sum of its proper divisors (10353283).

25664765 is a wasteful number, since it uses less digits than its factorization.

25664765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17108.

The product of its digits is 302400, while the sum is 41.

The square root of 25664765 is about 5066.0403669927. The cubic root of 25664765 is about 294.9708484073.

The spelling of 25664765 in words is "twenty-five million, six hundred sixty-four thousand, seven hundred sixty-five".