77215228 has 6 divisors (see below), whose sum is σ = 135126656. Its totient is φ = 38607612.

The previous prime is 77215213. The next prime is 77215231. The reversal of 77215228 is 82251277.

It is a junction number, because it is equal to n+sod(n) for n = 77215193 and 77215202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9651900 + ... + 9651907.

Almost surely, 2^77215228 is an apocalyptic number.

It is an amenable number.

77215228 is a deficient number, since it is larger than the sum of its proper divisors (57911428).

77215228 is a wasteful number, since it uses less digits than its factorization.

77215228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19303811 (or 19303809 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 77215228 is about 8787.2195830080. The cubic root of 77215228 is about 425.8281025991.

The spelling of 77215228 in words is "seventy-seven million, two hundred fifteen thousand, two hundred twenty-eight".