78030791 has 2 divisors, whose sum is σ = 78030792. Its totient is φ = 78030790.

The previous prime is 78030781. The next prime is 78030809. The reversal of 78030791 is 19703087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78030791 - 2¹⁰ = 78029767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78030761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39015395 + 39015396.

It is an arithmetic number, because the mean of its divisors is an integer number (39015396).

Almost surely, 2^78030791 is an apocalyptic number.

78030791 is a deficient number, since it is larger than the sum of its proper divisors (1).

78030791 is an equidigital number, since it uses as much as digits as its factorization.

78030791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 78030791 is about 8833.5038914352. The cubic root of 78030791 is about 427.3220827535.

The spelling of 78030791 in words is "seventy-eight million, thirty thousand, seven hundred ninety-one".