25223664 has 20 divisors (see below), whose sum is σ = 65161256. Its totient is φ = 8407872.

The previous prime is 25223647. The next prime is 25223669. The reversal of 25223664 is 46632252.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25223669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262699 + ... + 262794.

Almost surely, 2^25223664 is an apocalyptic number.

25223664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25223664 is an abundant number, since it is smaller than the sum of its proper divisors (39937592).

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

25223664 is a wasteful number, since it uses less digits than its factorization.

25223664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525504 (or 525498 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

The square root of 25223664 is about 5022.3165969501. The cubic root of 25223664 is about 293.2711828841.

The spelling of 25223664 in words is "twenty-five million, two hundred twenty-three thousand, six hundred sixty-four".