778772 has 12 divisors (see below), whose sum is σ = 1434720. Its totient is φ = 368856.

The previous prime is 778769. The next prime is 778777. The reversal of 778772 is 277877.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5048 + ... + 5199.

It is an arithmetic number, because the mean of its divisors is an integer number (119560).

2⁷⁷⁸⁷⁷² is an apocalyptic number.

It is an amenable number.

778772 is a deficient number, since it is larger than the sum of its proper divisors (655948).

778772 is a wasteful number, since it uses less digits than its factorization.

778772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270 (or 10268 counting only the distinct ones).

The product of its digits is 38416, while the sum is 38.

The square root of 778772 is about 882.4805946875. The cubic root of 778772 is about 92.0033080096.

The spelling of 778772 in words is "seven hundred seventy-eight thousand, seven hundred seventy-two".