28943769 has 8 divisors (see below), whose sum is σ = 39922560. Its totient is φ = 18630416.

The previous prime is 28943767. The next prime is 28943819. The reversal of 28943769 is 96734982.

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

It is a cyclic number.

It is not a de Polignac number, because 28943769 - 2¹ = 28943767 is a prime.

It is a super-2 number, since 2×28943769² = 1675483527850722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28943767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166257 + ... + 166430.

It is an arithmetic number, because the mean of its divisors is an integer number (4990320).

Almost surely, 2^28943769 is an apocalyptic number.

28943769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28943769 is a deficient number, since it is larger than the sum of its proper divisors (10978791).

28943769 is a wasteful number, since it uses less digits than its factorization.

28943769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332719.

The product of its digits is 653184, while the sum is 48.

The square root of 28943769 is about 5379.9413565577. The cubic root of 28943769 is about 307.0329800076.

The spelling of 28943769 in words is "twenty-eight million, nine hundred forty-three thousand, seven hundred sixty-nine".