28304372 has 6 divisors (see below), whose sum is σ = 49532658. Its totient is φ = 14152184.

The previous prime is 28304347. The next prime is 28304399. The reversal of 28304372 is 27340382.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 7107556 = 4604^2 + 2666^2 .

It is a super-2 number, since 2×28304372² = 1602274948628768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3538043 + ... + 3538050.

It is an arithmetic number, because the mean of its divisors is an integer number (8255443).

Almost surely, 2^28304372 is an apocalyptic number.

It is an amenable number.

28304372 is a deficient number, since it is larger than the sum of its proper divisors (21228286).

28304372 is a wasteful number, since it uses less digits than its factorization.

28304372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7076097 (or 7076095 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 28304372 is about 5320.1853351176. The cubic root of 28304372 is about 304.7552349622.

The spelling of 28304372 in words is "twenty-eight million, three hundred four thousand, three hundred seventy-two".