78500797 has 2 divisors, whose sum is σ = 78500798. Its totient is φ = 78500796.

The previous prime is 78500749. The next prime is 78500801. The reversal of 78500797 is 79700587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 26357956 = 7221^2 + 5134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78500797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78500707) 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, 39250398 + 39250399.

It is an arithmetic number, because the mean of its divisors is an integer number (39250399).

Almost surely, 2^78500797 is an apocalyptic number.

It is an amenable number.

78500797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78500797 is an equidigital number, since it uses as much as digits as its factorization.

78500797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 43.

The square root of 78500797 is about 8860.0675505326. The cubic root of 78500797 is about 428.1783346416.

It can be divided in two parts, 78500 and 797, that added together give a palindrome (79297).

The spelling of 78500797 in words is "seventy-eight million, five hundred thousand, seven hundred ninety-seven".