77225228 has 6 divisors (see below), whose sum is σ = 135144156. Its totient is φ = 38612612.

The previous prime is 77225221. The next prime is 77225243. The reversal of 77225228 is 82252277.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77225221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9653150 + ... + 9653157.

It is an arithmetic number, because the mean of its divisors is an integer number (22524026).

Almost surely, 2^77225228 is an apocalyptic number.

It is an amenable number.

77225228 is a deficient number, since it is larger than the sum of its proper divisors (57918928).

77225228 is a wasteful number, since it uses less digits than its factorization.

77225228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19306311 (or 19306309 counting only the distinct ones).

The product of its digits is 31360, while the sum is 35.

The square root of 77225228 is about 8787.7885727867. The cubic root of 77225228 is about 425.8464845397.

The spelling of 77225228 in words is "seventy-seven million, two hundred twenty-five thousand, two hundred twenty-eight".