28328493 has 8 divisors (see below), whose sum is σ = 38069248. Its totient is φ = 18736704.

The previous prime is 28328473. The next prime is 28328501. The reversal of 28328493 is 39482382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28328493 - 2¹⁸ = 28066349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36796 + ... + 37557.

It is an arithmetic number, because the mean of its divisors is an integer number (4758656).

Almost surely, 2^28328493 is an apocalyptic number.

It is an amenable number.

28328493 is a deficient number, since it is larger than the sum of its proper divisors (9740755).

28328493 is a wasteful number, since it uses less digits than its factorization.

28328493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74483.

The product of its digits is 82944, while the sum is 39.

The square root of 28328493 is about 5322.4517846571. The cubic root of 28328493 is about 304.8417812366.

It can be divided in two parts, 2832 and 8493, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 28328493 in words is "twenty-eight million, three hundred twenty-eight thousand, four hundred ninety-three".