779461978 has 4 divisors (see below), whose sum is σ = 1169192970. Its totient is φ = 389730988.

The previous prime is 779461897. The next prime is 779461993. The reversal of 779461978 is 879164977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 729378049 + 50083929 = 27007^2 + 7077^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 194865493 + ... + 194865496.

Almost surely, 2^779461978 is an apocalyptic number.

779461978 is a deficient number, since it is larger than the sum of its proper divisors (389730992).

779461978 is a wasteful number, since it uses less digits than its factorization.

779461978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389730991.

The product of its digits is 5334336, while the sum is 58.

The square root of 779461978 is about 27918.8462870513. The cubic root of 779461978 is about 920.3047108181.

The spelling of 779461978 in words is "seven hundred seventy-nine million, four hundred sixty-one thousand, nine hundred seventy-eight".