78255222 has 64 divisors (see below), whose sum is σ = 169150464. Its totient is φ = 24088320.

The previous prime is 78255217. The next prime is 78255239. The reversal of 78255222 is 22255287.

It is a super-2 number, since 2×78255222² = 12247759540538568, which contains 22 as substring.

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, 571138 + ... + 571274.

It is an arithmetic number, because the mean of its divisors is an integer number (2642976).

Almost surely, 2^78255222 is an apocalyptic number.

78255222 is an abundant number, since it is smaller than the sum of its proper divisors (90895242).

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

78255222 is a wasteful number, since it uses less digits than its factorization.

78255222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its digits is 22400, while the sum is 33.

The square root of 78255222 is about 8846.1981664442. The cubic root of 78255222 is about 427.7313764079.

The spelling of 78255222 in words is "seventy-eight million, two hundred fifty-five thousand, two hundred twenty-two".