78313865 has 16 divisors (see below), whose sum is σ = 107885952. Its totient is φ = 53458944.

The previous prime is 78313861. The next prime is 78313897. The reversal of 78313865 is 56831387.

It is not a de Polignac number, because 78313865 - 2² = 78313861 is a prime.

It is a super-2 number, since 2×78313865² = 12266122902476450, which contains 22 as substring.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 3017 + ... + 12873.

It is an arithmetic number, because the mean of its divisors is an integer number (6742872).

Almost surely, 2^78313865 is an apocalyptic number.

It is an amenable number.

78313865 is a deficient number, since it is larger than the sum of its proper divisors (29572087).

78313865 is a wasteful number, since it uses less digits than its factorization.

78313865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096.

The product of its digits is 120960, while the sum is 41.

The square root of 78313865 is about 8849.5121334455. The cubic root of 78313865 is about 427.8381943615.

The spelling of 78313865 in words is "seventy-eight million, three hundred thirteen thousand, eight hundred sixty-five".