79643042 has 4 divisors (see below), whose sum is σ = 119464566. Its totient is φ = 39821520.

The previous prime is 79643027. The next prime is 79643071. The reversal of 79643042 is 24034697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24034697 = 643 ⋅37379.

It can be written as a sum of positive squares in only one way, i.e., 78517321 + 1125721 = 8861^2 + 1061^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79642993 and 79643011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19910759 + ... + 19910762.

Almost surely, 2^79643042 is an apocalyptic number.

79643042 is a deficient number, since it is larger than the sum of its proper divisors (39821524).

79643042 is a wasteful number, since it uses less digits than its factorization.

79643042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39821523.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 79643042 is about 8924.2950421868. The cubic root of 79643042 is about 430.2451135411.

The spelling of 79643042 in words is "seventy-nine million, six hundred forty-three thousand, forty-two".