779661 has 6 divisors (see below), whose sum is σ = 1126190. Its totient is φ = 519768.

The previous prime is 779659. The next prime is 779663. The reversal of 779661 is 166977.

779661 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (779659) and next prime (779663).

It can be written as a sum of positive squares in only one way, i.e., 670761 + 108900 = 819^2 + 330^2 .

It is not a de Polignac number, because 779661 - 2¹ = 779659 is a prime.

It is a Duffinian number.

779661 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43306 + ... + 43323.

2⁷⁷⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

779661 is a deficient number, since it is larger than the sum of its proper divisors (346529).

779661 is a wasteful number, since it uses less digits than its factorization.

779661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86635 (or 86632 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 779661 is about 882.9841448180. The cubic root of 779661 is about 92.0383032063.

The spelling of 779661 in words is "seven hundred seventy-nine thousand, six hundred sixty-one".