28404545 has 8 divisors (see below), whose sum is σ = 36707496. Its totient is φ = 20975616.

The previous prime is 28404539. The next prime is 28404557. The reversal of 28404545 is 54540482.

It can be written as a sum of positive squares in 4 ways, for example, as 863041 + 27541504 = 929^2 + 5248^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28404545 - 2⁸ = 28404289 is a prime.

It is a Duffinian number.

28404545 is a modest number, since divided by 4545 gives 2840 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218432 + ... + 218561.

It is an arithmetic number, because the mean of its divisors is an integer number (4588437).

Almost surely, 2^28404545 is an apocalyptic number.

It is an amenable number.

28404545 is a deficient number, since it is larger than the sum of its proper divisors (8302951).

28404545 is a wasteful number, since it uses less digits than its factorization.

28404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437011.

The product of its (nonzero) digits is 25600, while the sum is 32.

The square root of 28404545 is about 5329.5914477566. The cubic root of 28404545 is about 305.1143349894.

The spelling of 28404545 in words is "twenty-eight million, four hundred four thousand, five hundred forty-five".