28793438 has 4 divisors (see below), whose sum is σ = 43190160. Its totient is φ = 14396718.

The previous prime is 28793431. The next prime is 28793449. The reversal of 28793438 is 83439782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83439782 = 2 ⋅41719891.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28793431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7198358 + ... + 7198361.

It is an arithmetic number, because the mean of its divisors is an integer number (10797540).

Almost surely, 2^28793438 is an apocalyptic number.

28793438 is a deficient number, since it is larger than the sum of its proper divisors (14396722).

28793438 is a wasteful number, since it uses less digits than its factorization.

28793438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14396721.

The product of its digits is 290304, while the sum is 44.

The square root of 28793438 is about 5365.9517329175. The cubic root of 28793438 is about 306.5004909924.

The spelling of 28793438 in words is "twenty-eight million, seven hundred ninety-three thousand, four hundred thirty-eight".