77642216 has 16 divisors (see below), whose sum is σ = 147574500. Its totient is φ = 38289024.

The previous prime is 77642207. The next prime is 77642239. The reversal of 77642216 is 61224677.

It can be written as a sum of positive squares in 2 ways, for example, as 76912900 + 729316 = 8770^2 + 854^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65891 + ... + 67058.

Almost surely, 2^77642216 is an apocalyptic number.

It is an amenable number.

77642216 is a deficient number, since it is larger than the sum of its proper divisors (69932284).

77642216 is a wasteful number, since it uses less digits than its factorization.

77642216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133028 (or 133024 counting only the distinct ones).

The product of its digits is 28224, while the sum is 35.

The square root of 77642216 is about 8811.4820546830. The cubic root of 77642216 is about 426.6115808875.

The spelling of 77642216 in words is "seventy-seven million, six hundred forty-two thousand, two hundred sixteen".