78277868 has 6 divisors (see below), whose sum is σ = 136986276. Its totient is φ = 39138932.

The previous prime is 78277867. The next prime is 78277879. The reversal of 78277868 is 86877287.

It is a happy number.

It is a super-2 number, since 2×78277868² = 12254849237250848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78277867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9784730 + ... + 9784737.

It is an arithmetic number, because the mean of its divisors is an integer number (22831046).

Almost surely, 2^78277868 is an apocalyptic number.

It is an amenable number.

78277868 is a deficient number, since it is larger than the sum of its proper divisors (58708408).

78277868 is a wasteful number, since it uses less digits than its factorization.

78277868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19569471 (or 19569469 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 53.

The square root of 78277868 is about 8847.4780587465. The cubic root of 78277868 is about 427.7726323151.

The spelling of 78277868 in words is "seventy-eight million, two hundred seventy-seven thousand, eight hundred sixty-eight".