30428 has 6 divisors (see below), whose sum is σ = 53256. Its totient is φ = 15212.

The previous prime is 30427. The next prime is 30431. The reversal of 30428 is 82403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3800 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (8876).

2³⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

30428 is a deficient number, since it is larger than the sum of its proper divisors (22828).

30428 is a wasteful number, since it uses less digits than its factorization.

30428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611 (or 7609 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 30428 is about 174.4362347679. The cubic root of 30428 is about 31.2193940346.

It can be divided in two parts, 3042 and 8, that multiplied together give a square (24336 = 156²).

The spelling of 30428 in words is "thirty thousand, four hundred twenty-eight".