28303812 has 36 divisors (see below), whose sum is σ = 72212140. Its totient is φ = 9346752.

The previous prime is 28303801. The next prime is 28303831. The reversal of 28303812 is 21830382.

28303812 is a `hidden beast` number, since 283 + 0 + 381 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21678336 + 6625476 = 4656^2 + 2574^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28303812² = 1602211547462688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318 + ... + 7530.

Almost surely, 2^28303812 is an apocalyptic number.

It is an amenable number.

28303812 is an abundant number, since it is smaller than the sum of its proper divisors (43908328).

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

28303812 is a wasteful number, since it uses less digits than its factorization.

28303812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7332 (or 7327 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28303812 is about 5320.1327051118. The cubic root of 28303812 is about 304.7532250954.

The spelling of 28303812 in words is "twenty-eight million, three hundred three thousand, eight hundred twelve".