78999433 has 4 divisors (see below), whose sum is σ = 80680320. Its totient is φ = 77318548.

The previous prime is 78999421. The next prime is 78999443. The reversal of 78999433 is 33499987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33499987 = 311 ⋅107717.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78999433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78999413) 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, 840373 + ... + 840466.

It is an arithmetic number, because the mean of its divisors is an integer number (20170080).

Almost surely, 2^78999433 is an apocalyptic number.

It is an amenable number.

78999433 is a deficient number, since it is larger than the sum of its proper divisors (1680887).

78999433 is a wasteful number, since it uses less digits than its factorization.

78999433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680886.

The product of its digits is 1469664, while the sum is 52.

The square root of 78999433 is about 8888.1625210164. The cubic root of 78999433 is about 429.0830161573.

The spelling of 78999433 in words is "seventy-eight million, nine hundred ninety-nine thousand, four hundred thirty-three".