28387834 has 4 divisors (see below), whose sum is σ = 42581754. Its totient is φ = 14193916.

The previous prime is 28387787. The next prime is 28387861. The reversal of 28387834 is 43878382.

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

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 7273809 = 4595^2 + 2697^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7096957 + ... + 7096960.

Almost surely, 2^28387834 is an apocalyptic number.

28387834 is a deficient number, since it is larger than the sum of its proper divisors (14193920).

28387834 is a wasteful number, since it uses less digits than its factorization.

28387834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14193919.

The product of its digits is 258048, while the sum is 43.

The square root of 28387834 is about 5328.0234609093. The cubic root of 28387834 is about 305.0544881600.

The spelling of 28387834 in words is "twenty-eight million, three hundred eighty-seven thousand, eight hundred thirty-four".