28987982 has 4 divisors (see below), whose sum is σ = 43481976. Its totient is φ = 14493990.

The previous prime is 28987963. The next prime is 28987991. The reversal of 28987982 is 28978982.

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

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, 7246994 + ... + 7246997.

It is an arithmetic number, because the mean of its divisors is an integer number (10870494).

Almost surely, 2^28987982 is an apocalyptic number.

28987982 is a deficient number, since it is larger than the sum of its proper divisors (14493994).

28987982 is a wasteful number, since it uses less digits than its factorization.

28987982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14493993.

The product of its digits is 1161216, while the sum is 53.

The square root of 28987982 is about 5384.0488482182. The cubic root of 28987982 is about 307.1892363556.

The spelling of 28987982 in words is "twenty-eight million, nine hundred eighty-seven thousand, nine hundred eighty-two".