778679089 has 2 divisors, whose sum is σ = 778679090. Its totient is φ = 778679088.

The previous prime is 778679047. The next prime is 778679123. The reversal of 778679089 is 980976877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690638400 + 88040689 = 26280^2 + 9383^2 .

It is a cyclic number.

It is not a de Polignac number, because 778679089 - 2¹⁹ = 778154801 is a prime.

It is a super-2 number, since 2×778679089² = 1212682247291739842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (778679009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389339544 + 389339545.

It is an arithmetic number, because the mean of its divisors is an integer number (389339545).

Almost surely, 2^778679089 is an apocalyptic number.

It is an amenable number.

778679089 is a deficient number, since it is larger than the sum of its proper divisors (1).

778679089 is an equidigital number, since it uses as much as digits as its factorization.

778679089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The square root of 778679089 is about 27904.8219668214. The cubic root of 778679089 is about 919.9964906136.

The spelling of 778679089 in words is "seven hundred seventy-eight million, six hundred seventy-nine thousand, eighty-nine".