25687764 has 36 divisors (see below), whose sum is σ = 65141076. Its totient is φ = 8535168.

The previous prime is 25687763. The next prime is 25687769. The reversal of 25687764 is 46778652.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 7128900 = 4308^2 + 2670^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×25687764² = 1319722438639392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25687763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12472 + ... + 14384.

Almost surely, 2^25687764 is an apocalyptic number.

It is an amenable number.

25687764 is an abundant number, since it is smaller than the sum of its proper divisors (39453312).

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

25687764 is a wasteful number, since it uses less digits than its factorization.

25687764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2291 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 25687764 is about 5068.3097774307. The cubic root of 25687764 is about 295.0589329737.

The spelling of 25687764 in words is "twenty-five million, six hundred eighty-seven thousand, seven hundred sixty-four".