23639681520 has 1440 divisors, whose sum is σ = 108920028672. Its totient is φ = 4713375744.

The previous prime is 23639681491. The next prime is 23639681537. The reversal of 23639681520 is 2518693632.

23639681520 is a `hidden beast` number, since 2 + 3 + 63 + 9 + 68 + 1 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 284815399 + ... + 284815481.

Almost surely, 2^23639681520 is an apocalyptic number.

23639681520 is a gapful number since it is divisible by the number (20) 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 23639681520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54460014336).

23639681520 is an abundant number, since it is smaller than the sum of its proper divisors (85280347152).

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

23639681520 is a wasteful number, since it uses less digits than its factorization.

23639681520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 23639681520 in words is "twenty-three billion, six hundred thirty-nine million, six hundred eighty-one thousand, five hundred twenty".