628778 has 16 divisors (see below), whose sum is σ = 1005480. Its totient is φ = 294336.

The previous prime is 628759. The next prime is 628781. The reversal of 628778 is 877826.

It can be written as a sum of positive squares in 4 ways, for example, as 619369 + 9409 = 787^2 + 97^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2000 + ... + 2292.

2⁶²⁸⁷⁷⁸ is an apocalyptic number.

628778 is a deficient number, since it is larger than the sum of its proper divisors (376702).

628778 is a wasteful number, since it uses less digits than its factorization.

628778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 37632, while the sum is 38.

The square root of 628778 is about 792.9552320276. The cubic root of 628778 is about 85.6707257502.

The spelling of 628778 in words is "six hundred twenty-eight thousand, seven hundred seventy-eight".