69728 has 12 divisors (see below), whose sum is σ = 137340. Its totient is φ = 34848.

The previous prime is 69709. The next prime is 69737. The reversal of 69728 is 82796.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 2179 = 69728 / (6 + 9 + 7 + 2 + 8).

It is a d-powerful number, because it can be written as 6⁵ + 9⁵ + 7³ + 2¹¹ + 8³ .

It is a junction number, because it is equal to n+sod(n) for n = 69694 and 69703.

It is a congruent number.

It is an unprimeable number.

69728 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, 1058 + ... + 1121.

It is an arithmetic number, because the mean of its divisors is an integer number (11445).

2⁶⁹⁷²⁸ is an apocalyptic number.

It is an amenable number.

69728 is a deficient number, since it is larger than the sum of its proper divisors (67612).

69728 is a wasteful number, since it uses less digits than its factorization.

69728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189 (or 2181 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 69728 is about 264.0605991056. The cubic root of 69728 is about 41.1594032508.

Subtracting from 69728 its sum of digits (32), we obtain a palindrome (69696).

It can be divided in two parts, 69 and 728, that added together give a palindrome (797).

The spelling of 69728 in words is "sixty-nine thousand, seven hundred twenty-eight".