28736578 has 16 divisors (see below), whose sum is σ = 46836216. Its totient is φ = 13144320.

The previous prime is 28736573. The next prime is 28736581. The reversal of 28736578 is 87563782.

It can be written as a sum of positive squares in 4 ways, for example, as 9753129 + 18983449 = 3123^2 + 4357^2 .

It is not an unprimeable number, because it can be changed into a prime (28736573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1953 + ... + 7828.

Almost surely, 2^28736578 is an apocalyptic number.

28736578 is a deficient number, since it is larger than the sum of its proper divisors (18099638).

28736578 is a wasteful number, since it uses less digits than its factorization.

28736578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909.

The product of its digits is 564480, while the sum is 46.

The square root of 28736578 is about 5360.6508933151. The cubic root of 28736578 is about 306.2986035313.

The spelling of 28736578 in words is "twenty-eight million, seven hundred thirty-six thousand, five hundred seventy-eight".