28783236 has 12 divisors (see below), whose sum is σ = 67160912. Its totient is φ = 9594408.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783236 is 63238782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 28783194 and 28783203.

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, 1199290 + ... + 1199313.

Almost surely, 2^28783236 is an apocalyptic number.

It is an amenable number.

28783236 is an abundant number, since it is smaller than the sum of its proper divisors (38377676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28783236 is a wasteful number, since it uses less digits than its factorization.

28783236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398610 (or 2398608 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 28783236 is about 5365.0010251630. The cubic root of 28783236 is about 306.4642872876.

The spelling of 28783236 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred thirty-six".