28780833 has 8 divisors (see below), whose sum is σ = 38410848. Its totient is φ = 19169024.

The previous prime is 28780819. The next prime is 28780861. The reversal of 28780833 is 33808782.

It is a happy number.

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 28780833 - 2²¹ = 26683681 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28780791 and 28780800.

It is not an unprimeable number, because it can be changed into a prime (28780733) 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, 291 + ... + 7592.

It is an arithmetic number, because the mean of its divisors is an integer number (4801356).

Almost surely, 2^28780833 is an apocalyptic number.

It is an amenable number.

28780833 is a deficient number, since it is larger than the sum of its proper divisors (9630015).

28780833 is a wasteful number, since it uses less digits than its factorization.

28780833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9103.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28780833 is about 5364.7770689936. Note that the first 3 decimals coincide. The cubic root of 28780833 is about 306.4557585479.

The spelling of 28780833 in words is "twenty-eight million, seven hundred eighty thousand, eight hundred thirty-three".