778945138 has 8 divisors (see below), whose sum is σ = 1175860332. Its totient is φ = 386991696.

The previous prime is 778945093. The next prime is 778945157. The reversal of 778945138 is 831549877.

It can be written as a sum of positive squares in 2 ways, for example, as 772117369 + 6827769 = 27787^2 + 2613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240045 + ... + 1240672.

Almost surely, 2^778945138 is an apocalyptic number.

778945138 is a deficient number, since it is larger than the sum of its proper divisors (396915194).

778945138 is a wasteful number, since it uses less digits than its factorization.

778945138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480876.

The product of its digits is 1693440, while the sum is 52.

The square root of 778945138 is about 27909.5886390323. The cubic root of 778945138 is about 920.1012561835.

The spelling of 778945138 in words is "seven hundred seventy-eight million, nine hundred forty-five thousand, one hundred thirty-eight".