23252781 has 16 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 14926080.

The previous prime is 23252777. The next prime is 23252783. The reversal of 23252781 is 18725232.

It is not a de Polignac number, because 23252781 - 2² = 23252777 is a prime.

It is a super-2 number, since 2×23252781² = 1081383648467922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23252783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8521 + ... + 10913.

It is an arithmetic number, because the mean of its divisors is an integer number (2010960).

Almost surely, 2^23252781 is an apocalyptic number.

It is an amenable number.

23252781 is a deficient number, since it is larger than the sum of its proper divisors (8922579).

23252781 is a wasteful number, since it uses less digits than its factorization.

23252781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516.

The product of its digits is 6720, while the sum is 30.

The square root of 23252781 is about 4822.1137481399. The cubic root of 23252781 is about 285.4247529230.

The spelling of 23252781 in words is "twenty-three million, two hundred fifty-two thousand, seven hundred eighty-one".