628915 has 24 divisors (see below), whose sum is σ = 935712. Its totient is φ = 403200.

The previous prime is 628913. The next prime is 628921. The reversal of 628915 is 519826.

628915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 628915 - 2¹ = 628913 is a prime.

It is a Duffinian number.

Its product of digits (4320) is a multiple of the sum of its prime divisors (180).

It is not an unprimeable number, because it can be changed into a prime (628913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4090 + ... + 4240.

It is an arithmetic number, because the mean of its divisors is an integer number (38988).

2⁶²⁸⁹¹⁵ is an apocalyptic number.

628915 is a deficient number, since it is larger than the sum of its proper divisors (306797).

628915 is a wasteful number, since it uses less digits than its factorization.

628915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 180 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 628915 is about 793.0416130318. The cubic root of 628915 is about 85.6769473616.

The spelling of 628915 in words is "six hundred twenty-eight thousand, nine hundred fifteen".