79090643 has 2 divisors, whose sum is σ = 79090644. Its totient is φ = 79090642.

The previous prime is 79090637. The next prime is 79090733. The reversal of 79090643 is 34609097.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79090643 - 2¹⁸ = 78828499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79090597 and 79090606.

It is not a weakly prime, because it can be changed into another prime (79090043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39545321 + 39545322.

It is an arithmetic number, because the mean of its divisors is an integer number (39545322).

Almost surely, 2^79090643 is an apocalyptic number.

79090643 is a deficient number, since it is larger than the sum of its proper divisors (1).

79090643 is an equidigital number, since it uses as much as digits as its factorization.

79090643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 79090643 is about 8893.2920226427. The cubic root of 79090643 is about 429.2480874248.

The spelling of 79090643 in words is "seventy-nine million, ninety thousand, six hundred forty-three".