23170721280 has 320 divisors, whose sum is σ = 85002559488. Its totient is φ = 5274501120.

The previous prime is 23170721267. The next prime is 23170721291. The reversal of 23170721280 is 8212707132.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15750945 + ... + 15752415.

Almost surely, 2^23170721280 is an apocalyptic number.

23170721280 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 23170721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42501279744).

23170721280 is an abundant number, since it is smaller than the sum of its proper divisors (61831838208).

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

23170721280 is a wasteful number, since it uses less digits than its factorization.

23170721280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797 (or 1781 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 23170721280 in words is "twenty-three billion, one hundred seventy million, seven hundred twenty-one thousand, two hundred eighty".