23445640 has 32 divisors (see below), whose sum is σ = 53043480. Its totient is φ = 9326592.

The previous prime is 23445593. The next prime is 23445647. The reversal of 23445640 is 4654432.

It can be written as a sum of positive squares in 4 ways, for example, as 19766916 + 3678724 = 4446^2 + 1918^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23445599 and 23445608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23445647) 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, 6202 + ... + 9238.

Almost surely, 2^23445640 is an apocalyptic number.

23445640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23445640 is an abundant number, since it is smaller than the sum of its proper divisors (29597840).

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

23445640 is a wasteful number, since it uses less digits than its factorization.

23445640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3237 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 23445640 is about 4842.0698053622. The cubic root of 23445640 is about 286.2116873776.

The spelling of 23445640 in words is "twenty-three million, four hundred forty-five thousand, six hundred forty".