28530556 has 12 divisors (see below), whose sum is σ = 52865568. Its totient is φ = 13426112.

The previous prime is 28530521. The next prime is 28530563. The reversal of 28530556 is 65503582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 209716 + ... + 209851.

It is an arithmetic number, because the mean of its divisors is an integer number (4405464).

Almost surely, 2^28530556 is an apocalyptic number.

It is an amenable number.

28530556 is a deficient number, since it is larger than the sum of its proper divisors (24335012).

28530556 is a wasteful number, since it uses less digits than its factorization.

28530556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419588 (or 419586 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 28530556 is about 5341.4001909612. The cubic root of 28530556 is about 305.5648620318.

The spelling of 28530556 in words is "twenty-eight million, five hundred thirty thousand, five hundred fifty-six".