77228018 has 12 divisors (see below), whose sum is σ = 134755182. Its totient is φ = 33097680.

The previous prime is 77228009. The next prime is 77228023. The reversal of 77228018 is 81082277.

It can be written as a sum of positive squares in only one way, i.e., 71859529 + 5368489 = 8477^2 + 2317^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 393923 + ... + 394118.

Almost surely, 2^77228018 is an apocalyptic number.

77228018 is a deficient number, since it is larger than the sum of its proper divisors (57527164).

77228018 is a wasteful number, since it uses less digits than its factorization.

77228018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788057 (or 788050 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 77228018 is about 8787.9473143619. The cubic root of 77228018 is about 425.8516128180.

The spelling of 77228018 in words is "seventy-seven million, two hundred twenty-eight thousand, eighteen".