28530312 has 16 divisors (see below), whose sum is σ = 71325840. Its totient is φ = 9510096.

The previous prime is 28530311. The next prime is 28530331. The reversal of 28530312 is 21303582.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1188763 = 28530312 / (2 + 8 + 5 + 3 + 0 + 3 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (28530311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594358 + ... + 594405.

It is an arithmetic number, because the mean of its divisors is an integer number (4457865).

Almost surely, 2^28530312 is an apocalyptic number.

It is an amenable number.

28530312 is an abundant number, since it is smaller than the sum of its proper divisors (42795528).

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

28530312 is a wasteful number, since it uses less digits than its factorization.

28530312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188772 (or 1188768 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 28530312 is about 5341.3773504593. The cubic root of 28530312 is about 305.5639909419.

Adding to 28530312 its reverse (21303582), we get a palindrome (49833894).

The spelling of 28530312 in words is "twenty-eight million, five hundred thirty thousand, three hundred twelve".