78996539 has 2 divisors, whose sum is σ = 78996540. Its totient is φ = 78996538.

The previous prime is 78996481. The next prime is 78996557. The reversal of 78996539 is 93569987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78996539 - 2¹⁶ = 78931003 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78996139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39498269 + 39498270.

It is an arithmetic number, because the mean of its divisors is an integer number (39498270).

Almost surely, 2^78996539 is an apocalyptic number.

78996539 is a deficient number, since it is larger than the sum of its proper divisors (1).

78996539 is an equidigital number, since it uses as much as digits as its factorization.

78996539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 78996539 is about 8887.9997187219. Note that the first 3 decimals coincide. The cubic root of 78996539 is about 429.0777765357.

The spelling of 78996539 in words is "seventy-eight million, nine hundred ninety-six thousand, five hundred thirty-nine".