778966 has 4 divisors (see below), whose sum is σ = 1168452. Its totient is φ = 389482.

The previous prime is 778963. The next prime is 778979. The reversal of 778966 is 669877.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194740 + ... + 194743.

It is an arithmetic number, because the mean of its divisors is an integer number (292113).

2⁷⁷⁸⁹⁶⁶ is an apocalyptic number.

778966 is a deficient number, since it is larger than the sum of its proper divisors (389486).

778966 is a wasteful number, since it uses less digits than its factorization.

778966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389485.

The product of its digits is 127008, while the sum is 43.

The square root of 778966 is about 882.5905052741. The cubic root of 778966 is about 92.0109470276.

The spelling of 778966 in words is "seven hundred seventy-eight thousand, nine hundred sixty-six".