628564 has 6 divisors (see below), whose sum is σ = 1099994. Its totient is φ = 314280.

The previous prime is 628561. The next prime is 628583. The reversal of 628564 is 465826.

628564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 20164 = 780^2 + 142^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78567 + ... + 78574.

2⁶²⁸⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

628564 is a deficient number, since it is larger than the sum of its proper divisors (471430).

628564 is a wasteful number, since it uses less digits than its factorization.

628564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157145 (or 157143 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 628564 is about 792.8202822834. The cubic root of 628564 is about 85.6610055121.

The spelling of 628564 in words is "six hundred twenty-eight thousand, five hundred sixty-four".