628780 has 24 divisors (see below), whose sum is σ = 1335600. Its totient is φ = 248640.

The previous prime is 628759. The next prime is 628781. The reversal of 628780 is 87826.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (628781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875 + ... + 3085.

It is an arithmetic number, because the mean of its divisors is an integer number (55650).

2⁶²⁸⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

628780 is an abundant number, since it is smaller than the sum of its proper divisors (706820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628780 is a wasteful number, since it uses less digits than its factorization.

628780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 367 counting only the distinct ones).

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

The square root of 628780 is about 792.9564931319. The cubic root of 628780 is about 85.6708165831.

The spelling of 628780 in words is "six hundred twenty-eight thousand, seven hundred eighty".