28404339 has 8 divisors (see below), whose sum is σ = 39094272. Its totient is φ = 18325320.

The previous prime is 28404329. The next prime is 28404353. The reversal of 28404339 is 93340482.

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

It is not a de Polignac number, because 28404339 - 2⁵ = 28404307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28404319) 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, 152619 + ... + 152804.

It is an arithmetic number, because the mean of its divisors is an integer number (4886784).

Almost surely, 2^28404339 is an apocalyptic number.

28404339 is a deficient number, since it is larger than the sum of its proper divisors (10689933).

28404339 is a wasteful number, since it uses less digits than its factorization.

28404339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305457.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28404339 is about 5329.5721216623. The cubic root of 28404339 is about 305.1135973879.

The spelling of 28404339 in words is "twenty-eight million, four hundred four thousand, three hundred thirty-nine".