79699999 has 2 divisors, whose sum is σ = 79700000. Its totient is φ = 79699998.

The previous prime is 79699981. The next prime is 79700053. The reversal of 79699999 is 99999697.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79699999 - 2⁵ = 79699967 is a prime.

79699999 is a modest number, since divided by 9999 gives 7969 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79699909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39849999 + 39850000.

It is an arithmetic number, because the mean of its divisors is an integer number (39850000).

Almost surely, 2^79699999 is an apocalyptic number.

79699999 is a deficient number, since it is larger than the sum of its proper divisors (1).

79699999 is an equidigital number, since it uses as much as digits as its factorization.

79699999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22320522, while the sum is 67.

The square root of 79699999 is about 8927.4855922594. The cubic root of 79699999 is about 430.3476528670.

The spelling of 79699999 in words is "seventy-nine million, six hundred ninety-nine thousand, nine hundred ninety-nine".