78120228 has 12 divisors (see below), whose sum is σ = 182280560. Its totient is φ = 26040072.

The previous prime is 78120197. The next prime is 78120233. The reversal of 78120228 is 82202187.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78120228² = 12205540045543968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78120195 and 78120204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254998 + ... + 3255021.

Almost surely, 2^78120228 is an apocalyptic number.

It is an amenable number.

78120228 is an abundant number, since it is smaller than the sum of its proper divisors (104160332).

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

78120228 is a wasteful number, since it uses less digits than its factorization.

78120228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6510026 (or 6510024 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 78120228 is about 8838.5648156248. The cubic root of 78120228 is about 427.4852824864.

The spelling of 78120228 in words is "seventy-eight million, one hundred twenty thousand, two hundred twenty-eight".