693428 has 6 divisors (see below), whose sum is σ = 1213506. Its totient is φ = 346712.

The previous prime is 693421. The next prime is 693431. The reversal of 693428 is 824396.

Added to its reverse (824396) it gives a square (1517824 = 1232²).

It can be written as a sum of positive squares in only one way, i.e., 425104 + 268324 = 652^2 + 518^2 .

It is a d-powerful number, because it can be written as 6⁷ + 9² + 4⁹ + 3⁹ + 2¹⁷ + 8³ .

It is a junction number, because it is equal to n+sod(n) for n = 693394 and 693403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (693421) by changing a digit.

693428 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 as a sum of consecutive naturals, namely, 86675 + ... + 86682.

It is an arithmetic number, because the mean of its divisors is an integer number (202251).

2⁶⁹³⁴²⁸ is an apocalyptic number.

It is an amenable number.

693428 is a deficient number, since it is larger than the sum of its proper divisors (520078).

693428 is a wasteful number, since it uses less digits than its factorization.

693428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173361 (or 173359 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 693428 is about 832.7232433408. The cubic root of 693428 is about 88.5116543325.

Subtracting from 693428 its sum of digits (32), we obtain a palindrome (693396).

Adding to 693428 its reverse (824396), we get a square (1517824 = 1232²).

The spelling of 693428 in words is "six hundred ninety-three thousand, four hundred twenty-eight".