28191536 has 20 divisors (see below), whose sum is σ = 54777000. Its totient is φ = 14055552.

The previous prime is 28191529. The next prime is 28191539. The reversal of 28191536 is 63519182.

It is a junction number, because it is equal to n+sod(n) for n = 28191496 and 28191505.

It is not an unprimeable number, because it can be changed into a prime (28191539) 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, 3740 + ... + 8388.

It is an arithmetic number, because the mean of its divisors is an integer number (2738850).

Almost surely, 2^28191536 is an apocalyptic number.

It is an amenable number.

28191536 is a deficient number, since it is larger than the sum of its proper divisors (26585464).

28191536 is a wasteful number, since it uses less digits than its factorization.

28191536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5036 (or 5030 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 28191536 is about 5309.5702274290. The cubic root of 28191536 is about 304.3497244815.

The spelling of 28191536 in words is "twenty-eight million, one hundred ninety-one thousand, five hundred thirty-six".