28993136 has 20 divisors (see below), whose sum is σ = 56523912. Its totient is φ = 14406336.

The previous prime is 28993103. The next prime is 28993141. The reversal of 28993136 is 63139982.

It is a super-2 number, since 2×28993136² = 1681203870228992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28993093 and 28993102.

It is a congruent number.

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, 2951 + ... + 8166.

Almost surely, 2^28993136 is an apocalyptic number.

It is an amenable number.

28993136 is a deficient number, since it is larger than the sum of its proper divisors (27530776).

28993136 is a wasteful number, since it uses less digits than its factorization.

28993136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11288 (or 11282 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 28993136 is about 5384.5274630185. The cubic root of 28993136 is about 307.2074411356.

The spelling of 28993136 in words is "twenty-eight million, nine hundred ninety-three thousand, one hundred thirty-six".