28464445 has 16 divisors (see below), whose sum is σ = 35026992. Its totient is φ = 22197760.

The previous prime is 28464439. The next prime is 28464463. The reversal of 28464445 is 54446482.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1205604 + 27258841 = 1098^2 + 5221^2 .

It is not a de Polignac number, because 28464445 - 2³ = 28464437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61515 + ... + 61975.

It is an arithmetic number, because the mean of its divisors is an integer number (2189187).

Almost surely, 2^28464445 is an apocalyptic number.

It is an amenable number.

28464445 is a deficient number, since it is larger than the sum of its proper divisors (6562547).

28464445 is a wasteful number, since it uses less digits than its factorization.

28464445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its digits is 122880, while the sum is 37.

The square root of 28464445 is about 5335.2080559243. The cubic root of 28464445 is about 305.3286612124.

The spelling of 28464445 in words is "twenty-eight million, four hundred sixty-four thousand, four hundred forty-five".