28786356 has 18 divisors (see below), whose sum is σ = 72765602. Its totient is φ = 9595440.

The previous prime is 28786343. The next prime is 28786397. The reversal of 28786356 is 65368782.

28786356 is a `hidden beast` number, since 2 + 8 + 7 + 8 + 635 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 11696400 = 4134^2 + 3420^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399775 + ... + 399846.

Almost surely, 2^28786356 is an apocalyptic number.

It is an amenable number.

28786356 is an abundant number, since it is smaller than the sum of its proper divisors (43979246).

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

28786356 is a wasteful number, since it uses less digits than its factorization.

28786356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799631 (or 799626 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28786356 is about 5365.2917907603. The cubic root of 28786356 is about 306.4753600989.

The spelling of 28786356 in words is "twenty-eight million, seven hundred eighty-six thousand, three hundred fifty-six".