28143938 has 8 divisors (see below), whose sum is σ = 42405888. Its totient is φ = 14008644.

The previous prime is 28143911. The next prime is 28143943. The reversal of 28143938 is 83934182.

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

It is a super-2 number, since 2×28143938² = 1584162492295688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31106 + ... + 31997.

It is an arithmetic number, because the mean of its divisors is an integer number (5300736).

Almost surely, 2^28143938 is an apocalyptic number.

28143938 is a deficient number, since it is larger than the sum of its proper divisors (14261950).

28143938 is a wasteful number, since it uses less digits than its factorization.

28143938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63328.

The product of its digits is 41472, while the sum is 38.

The square root of 28143938 is about 5305.0860501975. The cubic root of 28143938 is about 304.1783420885.

The spelling of 28143938 in words is "twenty-eight million, one hundred forty-three thousand, nine hundred thirty-eight".