78992099 has 2 divisors, whose sum is σ = 78992100. Its totient is φ = 78992098.

The previous prime is 78992093. The next prime is 78992107. The reversal of 78992099 is 99029987.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78992099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78992099.

It is not a weakly prime, because it can be changed into another prime (78992093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39496049 + 39496050.

It is an arithmetic number, because the mean of its divisors is an integer number (39496050).

Almost surely, 2^78992099 is an apocalyptic number.

78992099 is a deficient number, since it is larger than the sum of its proper divisors (1).

78992099 is an equidigital number, since it uses as much as digits as its factorization.

78992099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 78992099 is about 8887.7499402267. The cubic root of 78992099 is about 429.0697376138.

The spelling of 78992099 in words is "seventy-eight million, nine hundred ninety-two thousand, ninety-nine".