178720228656 has 280 divisors, whose sum is σ = 548343497520. Its totient is φ = 56246980608.

The previous prime is 178720228639. The next prime is 178720228657. The reversal of 178720228656 is 656822027871.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (178720228657) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 74683396 + ... + 74685788.

It is an arithmetic number, because the mean of its divisors is an integer number (1958369634).

Almost surely, 2^178720228656 is an apocalyptic number.

178720228656 is a gapful number since it is divisible by the number (16) 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 178720228656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274171748760).

178720228656 is an abundant number, since it is smaller than the sum of its proper divisors (369623268864).

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

178720228656 is a wasteful number, since it uses less digits than its factorization.

178720228656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 178720228656 in words is "one hundred seventy-eight billion, seven hundred twenty million, two hundred twenty-eight thousand, six hundred fifty-six".