28404934 has 4 divisors (see below), whose sum is σ = 42607404. Its totient is φ = 14202466.

The previous prime is 28404919. The next prime is 28404989. The reversal of 28404934 is 43940482.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28404934.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7101232 + ... + 7101235.

It is an arithmetic number, because the mean of its divisors is an integer number (10651851).

Almost surely, 2^28404934 is an apocalyptic number.

28404934 is a deficient number, since it is larger than the sum of its proper divisors (14202470).

28404934 is a wasteful number, since it uses less digits than its factorization.

28404934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14202469.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28404934 is about 5329.6279419862. The cubic root of 28404934 is about 305.1157278291.

The spelling of 28404934 in words is "twenty-eight million, four hundred four thousand, nine hundred thirty-four".