78730839 has 32 divisors (see below), whose sum is σ = 129427200. Its totient is φ = 46896480.

The previous prime is 78730801. The next prime is 78730867. The reversal of 78730839 is 93803787.

It is not a de Polignac number, because 78730839 - 2⁷ = 78730711 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78730794 and 78730803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78730039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15277 + ... + 19769.

It is an arithmetic number, because the mean of its divisors is an integer number (4044600).

Almost surely, 2^78730839 is an apocalyptic number.

78730839 is a deficient number, since it is larger than the sum of its proper divisors (50696361).

78730839 is a wasteful number, since it uses less digits than its factorization.

78730839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4566 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 78730839 is about 8873.0400089259. The cubic root of 78730839 is about 428.5961772851.

It can be divided in two parts, 787 and 30839, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 78730839 in words is "seventy-eight million, seven hundred thirty thousand, eight hundred thirty-nine".