28633778 has 8 divisors (see below), whose sum is σ = 43037568. Its totient is φ = 14287924.

The previous prime is 28633771. The next prime is 28633793. The reversal of 28633778 is 87733682.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28633771) 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, 13226 + ... + 15237.

It is an arithmetic number, because the mean of its divisors is an integer number (5379696).

Almost surely, 2^28633778 is an apocalyptic number.

28633778 is a deficient number, since it is larger than the sum of its proper divisors (14403790).

28633778 is a wasteful number, since it uses less digits than its factorization.

28633778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28968.

The product of its digits is 338688, while the sum is 44.

The square root of 28633778 is about 5351.0539148844. The cubic root of 28633778 is about 305.9329241961.

The spelling of 28633778 in words is "twenty-eight million, six hundred thirty-three thousand, seven hundred seventy-eight".