28893643 has 16 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 26913600.

The previous prime is 28893629. The next prime is 28893671. The reversal of 28893643 is 34639882.

It is a cyclic number.

It is not a de Polignac number, because 28893643 - 2²¹ = 26796491 is a prime.

It is a super-2 number, since 2×28893643² = 1669685211622898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28893643.

It is not an unprimeable number, because it can be changed into a prime (28893043) 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, 161328 + ... + 161506.

It is an arithmetic number, because the mean of its divisors is an integer number (1935360).

Almost surely, 2^28893643 is an apocalyptic number.

28893643 is a deficient number, since it is larger than the sum of its proper divisors (2072117).

28893643 is a wasteful number, since it uses less digits than its factorization.

28893643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 248832, while the sum is 43.

The square root of 28893643 is about 5375.2807368546. The cubic root of 28893643 is about 306.8556335092.

The spelling of 28893643 in words is "twenty-eight million, eight hundred ninety-three thousand, six hundred forty-three".