78866020868 has 24 divisors (see below), whose sum is σ = 143262747264. Its totient is φ = 37961316000.

The previous prime is 78866020861. The next prime is 78866020901. The reversal of 78866020868 is 86802066887.

It is a super-2 number, since 2×78866020868² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78866020861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3427058 + ... + 3449993.

It is an arithmetic number, because the mean of its divisors is an integer number (5969281136).

Almost surely, 2^78866020868 is an apocalyptic number.

It is an amenable number.

78866020868 is a deficient number, since it is larger than the sum of its proper divisors (64396726396).

78866020868 is a wasteful number, since it uses less digits than its factorization.

78866020868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6877163 (or 6877161 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 78866020868 in words is "seventy-eight billion, eight hundred sixty-six million, twenty thousand, eight hundred sixty-eight".