23723640 has 48 divisors (see below), whose sum is σ = 77103000. Its totient is φ = 6326208.

The previous prime is 23723639. The next prime is 23723683. The reversal of 23723640 is 4632732.

It is a super-2 number, since 2×23723640² = 1125622189699200, 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 11 ways as a sum of consecutive naturals, for example, 32590 + ... + 33309.

Almost surely, 2^23723640 is an apocalyptic number.

23723640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23723640 is an abundant number, since it is smaller than the sum of its proper divisors (53379360).

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

23723640 is a wasteful number, since it uses less digits than its factorization.

23723640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65916 (or 65909 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 23723640 is about 4870.6919426299. The cubic root of 23723640 is about 287.3384700691.

The spelling of 23723640 in words is "twenty-three million, seven hundred twenty-three thousand, six hundred forty".