78899983 has 2 divisors, whose sum is σ = 78899984. Its totient is φ = 78899982.

The previous prime is 78899971. The next prime is 78899993. The reversal of 78899983 is 38999887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78899983 - 2²⁵ = 45345551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78899903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39449991 + 39449992.

It is an arithmetic number, because the mean of its divisors is an integer number (39449992).

Almost surely, 2^78899983 is an apocalyptic number.

78899983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78899983 is an equidigital number, since it uses as much as digits as its factorization.

78899983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 61.

The square root of 78899983 is about 8882.5662395504. The cubic root of 78899983 is about 428.9028873338.

The spelling of 78899983 in words is "seventy-eight million, eight hundred ninety-nine thousand, nine hundred eighty-three".