72224178 has 32 divisors (see below), whose sum is σ = 156508800. Its totient is φ = 22218768.

The previous prime is 72224171. The next prime is 72224237. The reversal of 72224178 is 87142227.

It is not an unprimeable number, because it can be changed into a prime (72224171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10443 + ... + 15921.

It is an arithmetic number, because the mean of its divisors is an integer number (4890900).

Almost surely, 2^72224178 is an apocalyptic number.

72224178 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 72224178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78254400).

72224178 is an abundant number, since it is smaller than the sum of its proper divisors (84284622).

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

72224178 is a wasteful number, since it uses less digits than its factorization.

72224178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523 (or 5497 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

The square root of 72224178 is about 8498.4809230827. The cubic root of 72224178 is about 416.4480848906.

The spelling of 72224178 in words is "seventy-two million, two hundred twenty-four thousand, one hundred seventy-eight".