78367865 has 8 divisors (see below), whose sum is σ = 94105608. Its totient is φ = 62651520.

The previous prime is 78367787. The next prime is 78367879. The reversal of 78367865 is 56876387.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 77668969 = 836^2 + 8813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78367865 - 2¹⁸ = 78105721 is a prime.

It is a super-2 number, since 2×78367865² = 12283044529316450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4295 + ... + 13235.

It is an arithmetic number, because the mean of its divisors is an integer number (11763201).

Almost surely, 2^78367865 is an apocalyptic number.

It is an amenable number.

78367865 is a deficient number, since it is larger than the sum of its proper divisors (15737743).

78367865 is a wasteful number, since it uses less digits than its factorization.

78367865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10699.

The product of its digits is 1693440, while the sum is 50.

The square root of 78367865 is about 8852.5626233312. The cubic root of 78367865 is about 427.9365079631.

The spelling of 78367865 in words is "seventy-eight million, three hundred sixty-seven thousand, eight hundred sixty-five".