78816943 has 4 divisors (see below), whose sum is σ = 78948688. Its totient is φ = 78685200.

The previous prime is 78816931. The next prime is 78816971. The reversal of 78816943 is 34961887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78816943 - 2⁹ = 78816431 is a prime.

It is a super-2 number, since 2×78816943² = 12424221007730498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78816893 and 78816902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78816923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64971 + ... + 66172.

It is an arithmetic number, because the mean of its divisors is an integer number (19737172).

Almost surely, 2^78816943 is an apocalyptic number.

78816943 is a deficient number, since it is larger than the sum of its proper divisors (131745).

78816943 is a wasteful number, since it uses less digits than its factorization.

78816943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131744.

The product of its digits is 290304, while the sum is 46.

The square root of 78816943 is about 8877.8906841659. The cubic root of 78816943 is about 428.7523651296.

The spelling of 78816943 in words is "seventy-eight million, eight hundred sixteen thousand, nine hundred forty-three".