78388868 has 12 divisors (see below), whose sum is σ = 137251212. Its totient is φ = 39174240.

The previous prime is 78388859. The next prime is 78388873. The reversal of 78388868 is 86888387.

It can be written as a sum of positive squares in 2 ways, for example, as 70593604 + 7795264 = 8402^2 + 2792^2 .

It is a super-2 number, since 2×78388868² = 12289629252642848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6746 + ... + 14222.

It is an arithmetic number, because the mean of its divisors is an integer number (11437601).

Almost surely, 2^78388868 is an apocalyptic number.

It is an amenable number.

78388868 is a deficient number, since it is larger than the sum of its proper divisors (58862344).

78388868 is a wasteful number, since it uses less digits than its factorization.

78388868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102 (or 10100 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 56.

The square root of 78388868 is about 8853.7488105322. The cubic root of 78388868 is about 427.9747342933.

The spelling of 78388868 in words is "seventy-eight million, three hundred eighty-eight thousand, eight hundred sixty-eight".