23889581646 has 128 divisors (see below), whose sum is σ = 57533079552. Its totient is φ = 6476371200.

The previous prime is 23889581627. The next prime is 23889581669. The reversal of 23889581646 is 64618598832.

It is a super-2 number, since 2×23889581646² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23889581646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76324386 + ... + 76324698.

It is an arithmetic number, because the mean of its divisors is an integer number (449477184).

Almost surely, 2^23889581646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23889581646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28766539776).

23889581646 is an abundant number, since it is smaller than the sum of its proper divisors (33643497906).

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

23889581646 is an equidigital number, since it uses as much as digits as its factorization.

23889581646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 417 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 60.

The spelling of 23889581646 in words is "twenty-three billion, eight hundred eighty-nine million, five hundred eighty-one thousand, six hundred forty-six".