28404546 has 8 divisors (see below), whose sum is σ = 56809104. Its totient is φ = 9468180.

The previous prime is 28404539. The next prime is 28404557. The reversal of 28404546 is 64540482.

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

28404546 is an admirable number.

It is a super-2 number, since 2×28404546² = 1613636466932232, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 2367040 + ... + 2367051.

It is an arithmetic number, because the mean of its divisors is an integer number (7101138).

Almost surely, 2^28404546 is an apocalyptic number.

28404546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28404546 is a wasteful number, since it uses less digits than its factorization.

28404546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734096.

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 28404546 is about 5329.5915415724. The cubic root of 28404546 is about 305.1143385700.

The spelling of 28404546 in words is "twenty-eight million, four hundred four thousand, five hundred forty-six".