628138 has 8 divisors (see below), whose sum is σ = 1076832. Its totient is φ = 269196.

The previous prime is 628127. The next prime is 628139. The reversal of 628138 is 831826.

628138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (628139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22420 + ... + 22447.

It is an arithmetic number, because the mean of its divisors is an integer number (134604).

2⁶²⁸¹³⁸ is an apocalyptic number.

628138 is a deficient number, since it is larger than the sum of its proper divisors (448694).

628138 is a wasteful number, since it uses less digits than its factorization.

628138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44876.

The product of its digits is 2304, while the sum is 28.

The square root of 628138 is about 792.5515756088. The cubic root of 628138 is about 85.6416493101.

The spelling of 628138 in words is "six hundred twenty-eight thousand, one hundred thirty-eight".