77793228 has 18 divisors (see below), whose sum is σ = 196644084. Its totient is φ = 25931064.

The previous prime is 77793223. The next prime is 77793251. The reversal of 77793228 is 82239777.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (77793223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1080426 + ... + 1080497.

Almost surely, 2^77793228 is an apocalyptic number.

It is an amenable number.

77793228 is an abundant number, since it is smaller than the sum of its proper divisors (118850856).

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

77793228 is a wasteful number, since it uses less digits than its factorization.

77793228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160933 (or 2160928 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 77793228 is about 8820.0469386506. The cubic root of 77793228 is about 426.8879844093.

The spelling of 77793228 in words is "seventy-seven million, seven hundred ninety-three thousand, two hundred twenty-eight".