23112640 has 28 divisors (see below), whose sum is σ = 55037736. Its totient is φ = 9244928.

The previous prime is 23112637. The next prime is 23112641. The reversal of 23112640 is 4621132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23112641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35794 + ... + 36433.

Almost surely, 2^23112640 is an apocalyptic number.

23112640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23112640 is an abundant number, since it is smaller than the sum of its proper divisors (31925096).

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

23112640 is an equidigital number, since it uses as much as digits as its factorization.

23112640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72244 (or 72234 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 23112640 is about 4807.5607120451. The cubic root of 23112640 is about 284.8501931481.

Adding to 23112640 its reverse (4621132), we get a palindrome (27733772).

The spelling of 23112640 in words is "twenty-three million, one hundred twelve thousand, six hundred forty".