28043236 has 12 divisors (see below), whose sum is σ = 52850812. Its totient is φ = 12943008.

The previous prime is 28043227. The next prime is 28043243. The reversal of 28043236 is 63234082.

It can be written as a sum of positive squares in 2 ways, for example, as 2742336 + 25300900 = 1656^2 + 5030^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269595 + ... + 269698.

Almost surely, 2^28043236 is an apocalyptic number.

28043236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28043236 is a deficient number, since it is larger than the sum of its proper divisors (24807576).

28043236 is a wasteful number, since it uses less digits than its factorization.

28043236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539310 (or 539308 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 28043236 is about 5295.5864642172. The cubic root of 28043236 is about 303.8151143803.

The spelling of 28043236 in words is "twenty-eight million, forty-three thousand, two hundred thirty-six".