628155 has 48 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 298080.

The previous prime is 628139. The next prime is 628171. The reversal of 628155 is 551826.

It is an interprime number because it is at equal distance from previous prime (628139) and next prime (628171).

It is not a de Polignac number, because 628155 - 2⁴ = 628139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13342 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2⁶²⁸¹⁵⁵ is an apocalyptic number.

628155 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

628155 is a wasteful number, since it uses less digits than its factorization.

628155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 66 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 628155 is about 792.5623003903. The cubic root of 628155 is about 85.6424219083.

It can be divided in two parts, 6281 and 55, that added together give a palindrome (6336).

The spelling of 628155 in words is "six hundred twenty-eight thousand, one hundred fifty-five".