28432445 has 8 divisors (see below), whose sum is σ = 34153944. Its totient is φ = 22722624.

The previous prime is 28432421. The next prime is 28432471. The reversal of 28432445 is 54423482.

It can be written as a sum of positive squares in 4 ways, for example, as 1110916 + 27321529 = 1054^2 + 5227^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28432445 - 2¹⁰ = 28431421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3887 + ... + 8483.

It is an arithmetic number, because the mean of its divisors is an integer number (4269243).

Almost surely, 2^28432445 is an apocalyptic number.

It is an amenable number.

28432445 is a deficient number, since it is larger than the sum of its proper divisors (5721499).

28432445 is a wasteful number, since it uses less digits than its factorization.

28432445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839.

The product of its digits is 30720, while the sum is 32.

The square root of 28432445 is about 5332.2082667503. The cubic root of 28432445 is about 305.2142005134.

The spelling of 28432445 in words is "twenty-eight million, four hundred thirty-two thousand, four hundred forty-five".