23990640 has 40 divisors (see below), whose sum is σ = 74371728. Its totient is φ = 6397440.

The previous prime is 23990611. The next prime is 23990651. The reversal of 23990640 is 4609932.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49741 + ... + 50220.

Almost surely, 2^23990640 is an apocalyptic number.

23990640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23990640 is an abundant number, since it is smaller than the sum of its proper divisors (50381088).

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

23990640 is a wasteful number, since it uses less digits than its factorization.

23990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99977 (or 99971 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 23990640 is about 4898.0240914067. The cubic root of 23990640 is about 288.4124106968.

The spelling of 23990640 in words is "twenty-three million, nine hundred ninety thousand, six hundred forty".