28434487 has 4 divisors (see below), whose sum is σ = 28642176. Its totient is φ = 28226800.

The previous prime is 28434457. The next prime is 28434491. The reversal of 28434487 is 78443482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28434487 - 2¹⁵ = 28401719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28434407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103639 + ... + 103912.

It is an arithmetic number, because the mean of its divisors is an integer number (7160544).

Almost surely, 2^28434487 is an apocalyptic number.

28434487 is a deficient number, since it is larger than the sum of its proper divisors (207689).

28434487 is a wasteful number, since it uses less digits than its factorization.

28434487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207688.

The product of its digits is 172032, while the sum is 40.

The square root of 28434487 is about 5332.3997412047. The cubic root of 28434487 is about 305.2215071013.

The spelling of 28434487 in words is "twenty-eight million, four hundred thirty-four thousand, four hundred eighty-seven".