78806957 has 2 divisors, whose sum is σ = 78806958. Its totient is φ = 78806956.

The previous prime is 78806953. The next prime is 78806963. The reversal of 78806957 is 75960887.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 16491721 = 7894^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 78806957 - 2² = 78806953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78806953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39403478 + 39403479.

It is an arithmetic number, because the mean of its divisors is an integer number (39403479).

Almost surely, 2^78806957 is an apocalyptic number.

It is an amenable number.

78806957 is a deficient number, since it is larger than the sum of its proper divisors (1).

78806957 is an equidigital number, since it uses as much as digits as its factorization.

78806957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 78806957 is about 8877.3282579839. The cubic root of 78806957 is about 428.7342569167.

The spelling of 78806957 in words is "seventy-eight million, eight hundred six thousand, nine hundred fifty-seven".