23565728508 has 96 divisors (see below), whose sum is σ = 66574255104. Its totient is φ = 6333600768.

The previous prime is 23565728507. The next prime is 23565728579. The reversal of 23565728508 is 80582756532.

It is a super-2 number, since 2×23565728508² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23565728503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3799666 + ... + 3805862.

It is an arithmetic number, because the mean of its divisors is an integer number (693481824).

Almost surely, 2^23565728508 is an apocalyptic number.

23565728508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23565728508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33287127552).

23565728508 is an abundant number, since it is smaller than the sum of its proper divisors (43008526596).

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

23565728508 is a wasteful number, since it uses less digits than its factorization.

23565728508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891 (or 8889 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 51.

The spelling of 23565728508 in words is "twenty-three billion, five hundred sixty-five million, seven hundred twenty-eight thousand, five hundred eight".