28868783 has 4 divisors (see below), whose sum is σ = 28892568. Its totient is φ = 28845000.

The previous prime is 28868779. The next prime is 28868803. The reversal of 28868783 is 38786882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38786882 = 2 ⋅19393441.

It is a cyclic number.

It is not a de Polignac number, because 28868783 - 2² = 28868779 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28868773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9968 + ... + 12533.

It is an arithmetic number, because the mean of its divisors is an integer number (7223142).

Almost surely, 2^28868783 is an apocalyptic number.

28868783 is a deficient number, since it is larger than the sum of its proper divisors (23785).

28868783 is a wasteful number, since it uses less digits than its factorization.

28868783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23784.

The product of its digits is 1032192, while the sum is 50.

The square root of 28868783 is about 5372.9678018764. The cubic root of 28868783 is about 306.7676023816.

The spelling of 28868783 in words is "twenty-eight million, eight hundred sixty-eight thousand, seven hundred eighty-three".