28304522 has 8 divisors (see below), whose sum is σ = 43920900. Its totient is φ = 13664224.

The previous prime is 28304489. The next prime is 28304527. The reversal of 28304522 is 22540382.

It can be written as a sum of positive squares in 2 ways, for example, as 25210441 + 3094081 = 5021^2 + 1759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28304522² = 1602291931296968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28304491 and 28304500.

It is not an unprimeable number, because it can be changed into a prime (28304527) 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, 243947 + ... + 244062.

Almost surely, 2^28304522 is an apocalyptic number.

28304522 is a deficient number, since it is larger than the sum of its proper divisors (15616378).

28304522 is a wasteful number, since it uses less digits than its factorization.

28304522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488040.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28304522 is about 5320.1994323521. The cubic root of 28304522 is about 304.7557733149.

The spelling of 28304522 in words is "twenty-eight million, three hundred four thousand, five hundred twenty-two".