28783986 has 32 divisors (see below), whose sum is σ = 71774208. Its totient is φ = 7476240.

The previous prime is 28783967. The next prime is 28783991. The reversal of 28783986 is 68938782.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30690 + ... + 31613.

It is an arithmetic number, because the mean of its divisors is an integer number (2242944).

Almost surely, 2^28783986 is an apocalyptic number.

28783986 is an abundant number, since it is smaller than the sum of its proper divisors (42990222).

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

28783986 is a wasteful number, since it uses less digits than its factorization.

28783986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62326.

The product of its digits is 1161216, while the sum is 51.

The square root of 28783986 is about 5365.0709221780. The cubic root of 28783986 is about 306.4669490941.

The spelling of 28783986 in words is "twenty-eight million, seven hundred eighty-three thousand, nine hundred eighty-six".