28305012 has 12 divisors (see below), whose sum is σ = 66045056. Its totient is φ = 9435000.

The previous prime is 28305001. The next prime is 28305029. The reversal of 28305012 is 21050382.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28305012.

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, 1179364 + ... + 1179387.

Almost surely, 2^28305012 is an apocalyptic number.

It is an amenable number.

28305012 is an abundant number, since it is smaller than the sum of its proper divisors (37740044).

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

28305012 is a wasteful number, since it uses less digits than its factorization.

28305012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358758 (or 2358756 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28305012 is about 5320.2454830581. The cubic root of 28305012 is about 304.7575319205.

Adding to 28305012 its reverse (21050382), we get a palindrome (49355394).

The spelling of 28305012 in words is "twenty-eight million, three hundred five thousand, twelve".