78259897 has 2 divisors, whose sum is σ = 78259898. Its totient is φ = 78259896.

The previous prime is 78259877. The next prime is 78259981. The reversal of 78259897 is 79895287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64577296 + 13682601 = 8036^2 + 3699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78259897 is a prime.

It is a super-2 number, since 2×78259897² = 12249222956901218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78259817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39129948 + 39129949.

It is an arithmetic number, because the mean of its divisors is an integer number (39129949).

Almost surely, 2^78259897 is an apocalyptic number.

It is an amenable number.

78259897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78259897 is an equidigital number, since it uses as much as digits as its factorization.

78259897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The square root of 78259897 is about 8846.4624003044. The cubic root of 78259897 is about 427.7398938559.

The spelling of 78259897 in words is "seventy-eight million, two hundred fifty-nine thousand, eight hundred ninety-seven".