28045477 has 4 divisors (see below), whose sum is σ = 28129036. Its totient is φ = 27961920.

The previous prime is 28045471. The next prime is 28045499. The reversal of 28045477 is 77454082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10329796 + 17715681 = 3214^2 + 4209^2 .

It is a cyclic number.

It is not a de Polignac number, because 28045477 - 2³ = 28045469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045471) 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, 41274 + ... + 41947.

It is an arithmetic number, because the mean of its divisors is an integer number (7032259).

Almost surely, 2^28045477 is an apocalyptic number.

It is an amenable number.

28045477 is a deficient number, since it is larger than the sum of its proper divisors (83559).

28045477 is an equidigital number, since it uses as much as digits as its factorization.

28045477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83558.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 28045477 is about 5295.7980512856. The cubic root of 28045477 is about 303.8232070214.

It can be divided in two parts, 2804 and 5477, that added together give a square (8281 = 91²).

The spelling of 28045477 in words is "twenty-eight million, forty-five thousand, four hundred seventy-seven".