7778890057 has 2 divisors, whose sum is σ = 7778890058. Its totient is φ = 7778890056.

The previous prime is 7778889983. The next prime is 7778890069. The reversal of 7778890057 is 7500988777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6883025296 + 895864761 = 82964^2 + 29931^2 .

It is a cyclic number.

It is not a de Polignac number, because 7778890057 - 2⁷ = 7778889929 is a prime.

It is a super-2 number, since 2×7778890057² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7778889983 and 7778890010.

It is not a weakly prime, because it can be changed into another prime (7778890087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889445028 + 3889445029.

It is an arithmetic number, because the mean of its divisors is an integer number (3889445029).

Almost surely, 2^7778890057 is an apocalyptic number.

It is an amenable number.

7778890057 is a deficient number, since it is larger than the sum of its proper divisors (1).

7778890057 is an equidigital number, since it uses as much as digits as its factorization.

7778890057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6914880, while the sum is 58.

The square root of 7778890057 is about 88198.0161738347. The cubic root of 7778890057 is about 1981.4017602414.

The spelling of 7778890057 in words is "seven billion, seven hundred seventy-eight million, eight hundred ninety thousand, fifty-seven".