78256693 has 2 divisors, whose sum is σ = 78256694. Its totient is φ = 78256692.

The previous prime is 78256669. The next prime is 78256699. The reversal of 78256693 is 39665287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77053284 + 1203409 = 8778^2 + 1097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78256693 is a prime.

It is a super-2 number, since 2×78256693² = 12248219998592498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78256699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39128346 + 39128347.

It is an arithmetic number, because the mean of its divisors is an integer number (39128347).

Almost surely, 2^78256693 is an apocalyptic number.

It is an amenable number.

78256693 is a deficient number, since it is larger than the sum of its proper divisors (1).

78256693 is an equidigital number, since it uses as much as digits as its factorization.

78256693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 78256693 is about 8846.2813091151. The cubic root of 78256693 is about 427.7340564800.

It can be divided in two parts, 782 and 56693, that added together give a palindrome (57475).

The spelling of 78256693 in words is "seventy-eight million, two hundred fifty-six thousand, six hundred ninety-three".