78868 has 6 divisors (see below), whose sum is σ = 138026. Its totient is φ = 39432.

The previous prime is 78857. The next prime is 78877. The reversal of 78868 is 86887.

It can be written as a sum of positive squares in only one way, i.e., 49284 + 29584 = 222^2 + 172^2 .

It is a super-2 number, since 2×78868² = 12440322848, which contains 22 as substring.

It is an Ulam number.

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, 9855 + ... + 9862.

2⁷⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

78868 is a deficient number, since it is larger than the sum of its proper divisors (59158).

78868 is a wasteful number, since it uses less digits than its factorization.

78868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19721 (or 19719 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 78868 is about 280.8344708187. The cubic root of 78868 is about 42.8844925957.

It can be divided in two parts, 78 and 868, that added together give a triangular number (946 = T₄₃).

The spelling of 78868 in words is "seventy-eight thousand, eight hundred sixty-eight".