28999986 has 16 divisors (see below), whose sum is σ = 58104000. Its totient is φ = 9649328.

The previous prime is 28999979. The next prime is 28999991. The reversal of 28999986 is 68999982.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (3631500).

Almost surely, 2^28999986 is an apocalyptic number.

28999986 is an abundant number, since it is smaller than the sum of its proper divisors (29104014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28999986 is a wasteful number, since it uses less digits than its factorization.

28999986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8673.

The product of its digits is 5038848, while the sum is 60.

The square root of 28999986 is about 5385.1635072670. The cubic root of 28999986 is about 307.2316331290.

The spelling of 28999986 in words is "twenty-eight million, nine hundred ninety-nine thousand, nine hundred eighty-six".