78359797 has 2 divisors, whose sum is σ = 78359798. Its totient is φ = 78359796.

The previous prime is 78359779. The next prime is 78359833. The reversal of 78359797 is 79795387.

Together with previous prime (78359779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42850116 + 35509681 = 6546^2 + 5959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78359797 is a prime.

It is a super-2 number, since 2×78359797² = 12280515571762418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78359767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39179898 + 39179899.

It is an arithmetic number, because the mean of its divisors is an integer number (39179899).

Almost surely, 2^78359797 is an apocalyptic number.

It is an amenable number.

78359797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78359797 is an equidigital number, since it uses as much as digits as its factorization.

78359797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 55.

The square root of 78359797 is about 8852.1069243429. The cubic root of 78359797 is about 427.9218220531.

The spelling of 78359797 in words is "seventy-eight million, three hundred fifty-nine thousand, seven hundred ninety-seven".