28430428 has 12 divisors (see below), whose sum is σ = 53580520. Its totient is φ = 13121712.

The previous prime is 28430417. The next prime is 28430471. The reversal of 28430428 is 82403482.

It is a self number, because there is not a number n which added to its sum of digits gives 28430428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273318 + ... + 273421.

Almost surely, 2^28430428 is an apocalyptic number.

It is an amenable number.

28430428 is a deficient number, since it is larger than the sum of its proper divisors (25150092).

28430428 is a wasteful number, since it uses less digits than its factorization.

28430428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546756 (or 546754 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28430428 is about 5332.0191297481. The cubic root of 28430428 is about 305.2069830358.

The spelling of 28430428 in words is "twenty-eight million, four hundred thirty thousand, four hundred twenty-eight".