25664784 has 40 divisors (see below), whose sum is σ = 66579072. Its totient is φ = 8519040.

The previous prime is 25664783. The next prime is 25664843. The reversal of 25664784 is 48746652.

It is a super-2 number, since 2×25664784² = 1317362275533312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25664783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12022 + ... + 13994.

Almost surely, 2^25664784 is an apocalyptic number.

25664784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25664784 is an abundant number, since it is smaller than the sum of its proper divisors (40914288).

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

25664784 is a wasteful number, since it uses less digits than its factorization.

25664784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255 (or 2249 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 25664784 is about 5066.0422422242. The cubic root of 25664784 is about 294.9709211977.

The spelling of 25664784 in words is "twenty-five million, six hundred sixty-four thousand, seven hundred eighty-four".