78313866 has 16 divisors (see below), whose sum is σ = 165841344. Its totient is φ = 24569024.

The previous prime is 78313861. The next prime is 78313897. The reversal of 78313866 is 66831387.

It is a super-2 number, since 2×78313866² = 12266123215731912, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78313861) 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, 383790 + ... + 383993.

It is an arithmetic number, because the mean of its divisors is an integer number (10365084).

Almost surely, 2^78313866 is an apocalyptic number.

78313866 is an abundant number, since it is smaller than the sum of its proper divisors (87527478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78313866 is a wasteful number, since it uses less digits than its factorization.

78313866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767805.

The product of its digits is 145152, while the sum is 42.

The square root of 78313866 is about 8849.5121899458. The cubic root of 78313866 is about 427.8381961825.

The spelling of 78313866 in words is "seventy-eight million, three hundred thirteen thousand, eight hundred sixty-six".