25221264 has 40 divisors (see below), whose sum is σ = 65537472. Its totient is φ = 8357760.

The previous prime is 25221253. The next prime is 25221277. The reversal of 25221264 is 46212252.

It is a happy number.

It is a super-2 number, since 2×25221264² = 1272224315515392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7237 + ... + 10139.

Almost surely, 2^25221264 is an apocalyptic number.

25221264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25221264 is an abundant number, since it is smaller than the sum of its proper divisors (40316208).

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

25221264 is a wasteful number, since it uses less digits than its factorization.

25221264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095 (or 3089 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 25221264 is about 5022.0776577030. The cubic root of 25221264 is about 293.2618811273.

The spelling of 25221264 in words is "twenty-five million, two hundred twenty-one thousand, two hundred sixty-four".