78904571 has 2 divisors, whose sum is σ = 78904572. Its totient is φ = 78904570.

The previous prime is 78904561. The next prime is 78904577. The reversal of 78904571 is 17540987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78904571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78904577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39452285 + 39452286.

It is an arithmetic number, because the mean of its divisors is an integer number (39452286).

Almost surely, 2^78904571 is an apocalyptic number.

78904571 is a deficient number, since it is larger than the sum of its proper divisors (1).

78904571 is an equidigital number, since it uses as much as digits as its factorization.

78904571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78904571 is about 8882.8244944950. The cubic root of 78904571 is about 428.9112006786.

The spelling of 78904571 in words is "seventy-eight million, nine hundred four thousand, five hundred seventy-one".