28783998 has 20 divisors (see below), whose sum is σ = 64497840. Its totient is φ = 9594612.

The previous prime is 28783991. The next prime is 28784011. The reversal of 28783998 is 89938782.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 88678 + ... + 89001.

It is an arithmetic number, because the mean of its divisors is an integer number (3224892).

Almost surely, 2^28783998 is an apocalyptic number.

28783998 is an abundant number, since it is smaller than the sum of its proper divisors (35713842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28783998 is a wasteful number, since it uses less digits than its factorization.

28783998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177693 (or 177684 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 28783998 is about 5365.0720405228. The cubic root of 28783998 is about 306.4669916826.

The spelling of 28783998 in words is "twenty-eight million, seven hundred eighty-three thousand, nine hundred ninety-eight".