79090642 has 4 divisors (see below), whose sum is σ = 118635966. Its totient is φ = 39545320.

The previous prime is 79090637. The next prime is 79090643. The reversal of 79090642 is 24609097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24609097 = 71 ⋅346607.

It can be written as a sum of positive squares in only one way, i.e., 71588521 + 7502121 = 8461^2 + 2739^2 .

It is not an unprimeable number, because it can be changed into a prime (79090643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19772659 + ... + 19772662.

Almost surely, 2^79090642 is an apocalyptic number.

79090642 is a deficient number, since it is larger than the sum of its proper divisors (39545324).

79090642 is a wasteful number, since it uses less digits than its factorization.

79090642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39545323.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 79090642 is about 8893.2919664205. The cubic root of 79090642 is about 429.2480856157.

The spelling of 79090642 in words is "seventy-nine million, ninety thousand, six hundred forty-two".