72428 has 12 divisors (see below), whose sum is σ = 133560. Its totient is φ = 34272.

The previous prime is 72421. The next prime is 72431. The reversal of 72428 is 82427.

It is not an unprimeable number, because it can be changed into a prime (72421) by changing a digit.

72428 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 3 ways as a sum of consecutive naturals, for example, 401 + ... + 552.

It is an arithmetic number, because the mean of its divisors is an integer number (11130).

2⁷²⁴²⁸ is an apocalyptic number.

It is an amenable number.

72428 is a deficient number, since it is larger than the sum of its proper divisors (61132).

72428 is a wasteful number, since it uses less digits than its factorization.

72428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 974 counting only the distinct ones).

The product of its digits is 896, while the sum is 23.

The square root of 72428 is about 269.1245065021. The cubic root of 72428 is about 41.6839466105.

Subtracting 72428 from its reverse (82427), we obtain a palindrome (9999).

The spelling of 72428 in words is "seventy-two thousand, four hundred twenty-eight".