28491536 has 20 divisors (see below), whose sum is σ = 55538112. Its totient is φ = 14159136.

The previous prime is 28491523. The next prime is 28491553. The reversal of 28491536 is 63519482.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28491536.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2660 + ... + 8003.

Almost surely, 2^28491536 is an apocalyptic number.

It is an amenable number.

28491536 is a deficient number, since it is larger than the sum of its proper divisors (27046576).

28491536 is a wasteful number, since it uses less digits than its factorization.

28491536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10838 (or 10832 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 28491536 is about 5337.7463409195. The cubic root of 28491536 is about 305.4254958889.

The spelling of 28491536 in words is "twenty-eight million, four hundred ninety-one thousand, five hundred thirty-six".