28240756 has 12 divisors (see below), whose sum is σ = 49490980. Its totient is φ = 14100480.

The previous prime is 28240739. The next prime is 28240787. The reversal of 28240756 is 65704282.

It can be written as a sum of positive squares in 2 ways, for example, as 14668900 + 13571856 = 3830^2 + 3684^2 .

It is a congruent number.

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, 1515 + ... + 7666.

Almost surely, 2^28240756 is an apocalyptic number.

It is an amenable number.

28240756 is a deficient number, since it is larger than the sum of its proper divisors (21250224).

28240756 is a wasteful number, since it uses less digits than its factorization.

28240756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9954 (or 9952 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 28240756 is about 5314.2032328469. The cubic root of 28240756 is about 304.5267443253.

The spelling of 28240756 in words is "twenty-eight million, two hundred forty thousand, seven hundred fifty-six".