23281656 has 16 divisors (see below), whose sum is σ = 58204200. Its totient is φ = 7760544.

The previous prime is 23281613. The next prime is 23281663. The reversal of 23281656 is 65618232.

It is a super-2 number, since 2×23281656² = 1084071012204672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485011 + ... + 485058.

Almost surely, 2^23281656 is an apocalyptic number.

It is an amenable number.

23281656 is an abundant number, since it is smaller than the sum of its proper divisors (34922544).

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

23281656 is a wasteful number, since it uses less digits than its factorization.

23281656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970078 (or 970074 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 23281656 is about 4825.1068381954. The cubic root of 23281656 is about 285.5428496306.

Adding to 23281656 its reverse (65618232), we get a palindrome (88899888).

The spelling of 23281656 in words is "twenty-three million, two hundred eighty-one thousand, six hundred fifty-six".