628554 has 8 divisors (see below), whose sum is σ = 1257120. Its totient is φ = 209516.

The previous prime is 628547. The next prime is 628561. The reversal of 628554 is 455826.

628554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (628547) and next prime (628561).

It is a sphenic number, since it is the product of 3 distinct primes.

628554 is an admirable number.

It is an unprimeable number.

628554 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52374 + ... + 52385.

It is an arithmetic number, because the mean of its divisors is an integer number (157140).

2⁶²⁸⁵⁵⁴ is an apocalyptic number.

628554 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.

628554 is a wasteful number, since it uses less digits than its factorization.

628554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104764.

The product of its digits is 9600, while the sum is 30.

The square root of 628554 is about 792.8139756589. The cubic root of 628554 is about 85.6605512414.

The spelling of 628554 in words is "six hundred twenty-eight thousand, five hundred fifty-four".