238721165280 has 480 divisors, whose sum is σ = 938598645600. Its totient is φ = 56734691328.

The previous prime is 238721165273. The next prime is 238721165299. The reversal of 238721165280 is 82561127832.

238721165280 is a `hidden beast` number, since 2 + 3 + 8 + 7 + 2 + 116 + 528 + 0 = 666.

It is a Cunningham number, because it is equal to 488591²-1.

It is a tau number, because it is divible by the number of its divisors (480).

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 79 ways as a sum of consecutive naturals, for example, 4861491 + ... + 4910349.

It is an arithmetic number, because the mean of its divisors is an integer number (1955413845).

Almost surely, 2^238721165280 is an apocalyptic number.

238721165280 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 238721165280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469299322800).

238721165280 is an abundant number, since it is smaller than the sum of its proper divisors (699877480320).

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

238721165280 is a wasteful number, since it uses less digits than its factorization.

238721165280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48928 (or 48911 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 238721165280 in words is "two hundred thirty-eight billion, seven hundred twenty-one million, one hundred sixty-five thousand, two hundred eighty".