28531982 has 8 divisors (see below), whose sum is σ = 43841952. Its totient is φ = 13918000.

The previous prime is 28531981. The next prime is 28531999. The reversal of 28531982 is 28913582.

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

It is a super-3 number, since 3×28531982³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173894 + ... + 174057.

It is an arithmetic number, because the mean of its divisors is an integer number (5480244).

Almost surely, 2^28531982 is an apocalyptic number.

28531982 is a deficient number, since it is larger than the sum of its proper divisors (15309970).

28531982 is a wasteful number, since it uses less digits than its factorization.

28531982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347994.

The product of its digits is 34560, while the sum is 38.

The square root of 28531982 is about 5341.5336748915. The cubic root of 28531982 is about 305.5699528104.

The spelling of 28531982 in words is "twenty-eight million, five hundred thirty-one thousand, nine hundred eighty-two".