23047640 has 96 divisors (see below), whose sum is σ = 65869200. Its totient is φ = 7176960.

The previous prime is 23047637. The next prime is 23047643. The reversal of 23047640 is 4674032.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23047637) and next prime (23047643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23047643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21026 + ... + 22094.

Almost surely, 2^23047640 is an apocalyptic number.

23047640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

23047640 is the 3920-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23047640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32934600).

23047640 is an abundant number, since it is smaller than the sum of its proper divisors (42821560).

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

23047640 is a wasteful number, since it uses less digits than its factorization.

23047640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 23047640 is about 4800.7957673702. The cubic root of 23047640 is about 284.5829130417.

The spelling of 23047640 in words is "twenty-three million, forty-seven thousand, six hundred forty".