778022873 has 2 divisors, whose sum is σ = 778022874. Its totient is φ = 778022872.

The previous prime is 778022851. The next prime is 778022879. The reversal of 778022873 is 378220877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767954944 + 10067929 = 27712^2 + 3173^2 .

It is an emirp because it is prime and its reverse (378220877) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778022873 is a prime.

It is a super-2 number, since 2×778022873² = 1210639181822348258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (778022879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389011436 + 389011437.

It is an arithmetic number, because the mean of its divisors is an integer number (389011437).

Almost surely, 2^778022873 is an apocalyptic number.

It is an amenable number.

778022873 is a deficient number, since it is larger than the sum of its proper divisors (1).

778022873 is an equidigital number, since it uses as much as digits as its factorization.

778022873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 263424, while the sum is 44.

The square root of 778022873 is about 27893.0613773390. The cubic root of 778022873 is about 919.7379818582.

The spelling of 778022873 in words is "seven hundred seventy-eight million, twenty-two thousand, eight hundred seventy-three".