77947228 has 6 divisors (see below), whose sum is σ = 136407656. Its totient is φ = 38973612.

The previous prime is 77947217. The next prime is 77947267. The reversal of 77947228 is 82274977.

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, 9743400 + ... + 9743407.

Almost surely, 2^77947228 is an apocalyptic number.

It is an amenable number.

77947228 is a deficient number, since it is larger than the sum of its proper divisors (58460428).

77947228 is a wasteful number, since it uses less digits than its factorization.

77947228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19486811 (or 19486809 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 77947228 is about 8828.7727346444. The cubic root of 77947228 is about 427.1694888480.

The spelling of 77947228 in words is "seventy-seven million, nine hundred forty-seven thousand, two hundred twenty-eight".