78260779 has 2 divisors, whose sum is σ = 78260780. Its totient is φ = 78260778.

The previous prime is 78260773. The next prime is 78260803. The reversal of 78260779 is 97706287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78260779 - 2¹⁷ = 78129707 is a prime.

It is a super-2 number, since 2×78260779² = 12249499059373682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78260773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39130389 + 39130390.

It is an arithmetic number, because the mean of its divisors is an integer number (39130390).

Almost surely, 2^78260779 is an apocalyptic number.

78260779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78260779 is an equidigital number, since it uses as much as digits as its factorization.

78260779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 78260779 is about 8846.5122505991. The cubic root of 78260779 is about 427.7415007461.

The spelling of 78260779 in words is "seventy-eight million, two hundred sixty thousand, seven hundred seventy-nine".