679428 has 42 divisors (see below), whose sum is σ = 1790334. Its totient is φ = 225504.

The previous prime is 679423. The next prime is 679433. The reversal of 679428 is 824976.

It is an interprime number because it is at equal distance from previous prime (679423) and next prime (679433).

It can be written as a sum of positive squares in only one way, i.e., 492804 + 186624 = 702^2 + 432^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 6² + 7⁵ + 4³ + 9⁶ + 2¹⁷ + 8 .

It is a junction number, because it is equal to n+sod(n) for n = 679392 and 679401.

It is not an unprimeable number, because it can be changed into a prime (679423) by changing a digit.

679428 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 13 ways as a sum of consecutive naturals, for example, 2800 + ... + 3032.

It is an arithmetic number, because the mean of its divisors is an integer number (42627).

2⁶⁷⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 679428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895167).

679428 is an abundant number, since it is smaller than the sum of its proper divisors (1110906).

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

679428 is a wasteful number, since it uses less digits than its factorization.

679428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 238 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 679428 is about 824.2742262136. The cubic root of 679428 is about 87.9119297953.

The spelling of 679428 in words is "six hundred seventy-nine thousand, four hundred twenty-eight".