780628 has 6 divisors (see below), whose sum is σ = 1366106. Its totient is φ = 390312.

The previous prime is 780613. The next prime is 780631. The reversal of 780628 is 826087.

It can be written as a sum of positive squares in only one way, i.e., 777924 + 2704 = 882^2 + 52^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 780628.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97575 + ... + 97582.

2⁷⁸⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

780628 is a deficient number, since it is larger than the sum of its proper divisors (585478).

780628 is a wasteful number, since it uses less digits than its factorization.

780628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195161 (or 195159 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 780628 is about 883.5315500875. The cubic root of 780628 is about 92.0763386555.

The spelling of 780628 in words is "seven hundred eighty thousand, six hundred twenty-eight".