23440528609 has 9 divisors (see below), whose sum is σ = 23567212179. Its totient is φ = 23314524840.

The previous prime is 23440528583. The next prime is 23440528633. The reversal of 23440528609 is 90682504432.

The square root of 23440528609 is 153103.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9312829009 + 14127699600 = 96503^2 + 118860^2 .

It is not a de Polignac number, because 23440528609 - 2⁵ = 23440528577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23440528669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43327879 + ... + 43328419.

It is an arithmetic number, because the mean of its divisors is an integer number (2618579131).

Almost surely, 2^23440528609 is an apocalyptic number.

23440528609 is the 153103-rd square number.

23440528609 is the 76552-nd centered octagonal number.

It is an amenable number.

23440528609 is a deficient number, since it is larger than the sum of its proper divisors (126683570).

23440528609 is an frugal number, since it uses more digits than its factorization.

23440528609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

It can be divided in two parts, 23440 and 528609, that added together give a square (552049 = 743²).

The spelling of 23440528609 in words is "twenty-three billion, four hundred forty million, five hundred twenty-eight thousand, six hundred nine".