28311983 has 8 divisors (see below), whose sum is σ = 32612352. Its totient is φ = 24075576.

The previous prime is 28311973. The next prime is 28312003. The reversal of 28311983 is 38911382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28311983 - 2⁸ = 28311727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311973) by changing a digit.

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, 15035 + ... + 16812.

It is an arithmetic number, because the mean of its divisors is an integer number (4076544).

Almost surely, 2^28311983 is an apocalyptic number.

28311983 is a deficient number, since it is larger than the sum of its proper divisors (4300369).

28311983 is a wasteful number, since it uses less digits than its factorization.

28311983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31981.

The product of its digits is 10368, while the sum is 35.

The square root of 28311983 is about 5320.9005816685. The cubic root of 28311983 is about 304.7825485780.

The spelling of 28311983 in words is "twenty-eight million, three hundred eleven thousand, nine hundred eighty-three".