23909399560 has 32 divisors (see below), whose sum is σ = 53872954200. Its totient is φ = 9550105600.

The previous prime is 23909399551. The next prime is 23909399561. The reversal of 23909399560 is 6599390932.

It can be written as a sum of positive squares in 4 ways, for example, as 16575532516 + 7333867044 = 128746^2 + 85638^2 .

It is not an unprimeable number, because it can be changed into a prime (23909399561) 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, 398305 + ... + 454384.

Almost surely, 2^23909399560 is an apocalyptic number.

23909399560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23909399560 is an abundant number, since it is smaller than the sum of its proper divisors (29963554640).

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

23909399560 is a wasteful number, since it uses less digits than its factorization.

23909399560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853401 (or 853397 counting only the distinct ones).

The product of its (nonzero) digits is 3542940, while the sum is 55.

The spelling of 23909399560 in words is "twenty-three billion, nine hundred nine million, three hundred ninety-nine thousand, five hundred sixty".