28406873 has 4 divisors (see below), whose sum is σ = 30989328. Its totient is φ = 25824420.

The previous prime is 28406839. The next prime is 28406879. The reversal of 28406873 is 37860482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28406873 - 2¹⁴ = 28390489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28406879) 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, 1291211 + ... + 1291232.

It is an arithmetic number, because the mean of its divisors is an integer number (7747332).

Almost surely, 2^28406873 is an apocalyptic number.

It is an amenable number.

28406873 is a deficient number, since it is larger than the sum of its proper divisors (2582455).

28406873 is a wasteful number, since it uses less digits than its factorization.

28406873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582454.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28406873 is about 5329.8098465142. The cubic root of 28406873 is about 305.1226703546.

The spelling of 28406873 in words is "twenty-eight million, four hundred six thousand, eight hundred seventy-three".