28793643 has 16 divisors (see below), whose sum is σ = 39050016. Its totient is φ = 18869760.

The previous prime is 28793623. The next prime is 28793651. The reversal of 28793643 is 34639782.

It is not a de Polignac number, because 28793643 - 2⁹ = 28793131 is a prime.

It is a super-2 number, since 2×28793643² = 1658147754422898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28793595 and 28793604.

It is not an unprimeable number, because it can be changed into a prime (28793623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52953 + ... + 53493.

It is an arithmetic number, because the mean of its divisors is an integer number (2440626).

Almost surely, 2^28793643 is an apocalyptic number.

28793643 is a deficient number, since it is larger than the sum of its proper divisors (10256373).

28793643 is a wasteful number, since it uses less digits than its factorization.

28793643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814.

The product of its digits is 217728, while the sum is 42.

The square root of 28793643 is about 5365.9708348071. The cubic root of 28793643 is about 306.5012183855.

The spelling of 28793643 in words is "twenty-eight million, seven hundred ninety-three thousand, six hundred forty-three".