28883931 has 4 divisors (see below), whose sum is σ = 38511912. Its totient is φ = 19255952.

The previous prime is 28883923. The next prime is 28883941. The reversal of 28883931 is 13938882.

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

It is a cyclic number.

It is not a de Polignac number, because 28883931 - 2³ = 28883923 is a prime.

It is a super-2 number, since 2×28883931² = 1668562940025522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28883941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4813986 + ... + 4813991.

It is an arithmetic number, because the mean of its divisors is an integer number (9627978).

Almost surely, 2^28883931 is an apocalyptic number.

28883931 is a deficient number, since it is larger than the sum of its proper divisors (9627981).

28883931 is an equidigital number, since it uses as much as digits as its factorization.

28883931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9627980.

The product of its digits is 82944, while the sum is 42.

The square root of 28883931 is about 5374.3772662514. The cubic root of 28883931 is about 306.8212485998.

The spelling of 28883931 in words is "twenty-eight million, eight hundred eighty-three thousand, nine hundred thirty-one".