928638 has 32 divisors (see below), whose sum is σ = 2138400. Its totient is φ = 298368.

The previous prime is 928637. The next prime is 928643. The reversal of 928638 is 836829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (928637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (66825).

2⁹²⁸⁶³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 928638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069200).

928638 is an abundant number, since it is smaller than the sum of its proper divisors (1209762).

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

928638 is a wasteful number, since it uses less digits than its factorization.

928638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 627 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 928638 is about 963.6586532585. The cubic root of 928638 is about 97.5623270128.

Subtracting from 928638 its reverse (836829), we obtain a square (91809 = 303²).

The spelling of 928638 in words is "nine hundred twenty-eight thousand, six hundred thirty-eight".