23721864 has 32 divisors (see below), whose sum is σ = 59836320. Its totient is φ = 7836416.

The previous prime is 23721857. The next prime is 23721869. The reversal of 23721864 is 46812732.

It is not an unprimeable number, because it can be changed into a prime (23721869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1662 + ... + 7085.

It is an arithmetic number, because the mean of its divisors is an integer number (1869885).

Almost surely, 2^23721864 is an apocalyptic number.

23721864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

23721864 is an abundant number, since it is smaller than the sum of its proper divisors (36114456).

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

23721864 is a wasteful number, since it uses less digits than its factorization.

23721864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8869 (or 8865 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 23721864 is about 4870.5096242590. The cubic root of 23721864 is about 287.3312996425.

The spelling of 23721864 in words is "twenty-three million, seven hundred twenty-one thousand, eight hundred sixty-four".