28477009 has 4 divisors (see below), whose sum is σ = 31065840. Its totient is φ = 25888180.

The previous prime is 28476983. The next prime is 28477019. The reversal of 28477009 is 90077482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28477009 - 2¹¹ = 28474961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28477019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294399 + ... + 1294420.

It is an arithmetic number, because the mean of its divisors is an integer number (7766460).

Almost surely, 2^28477009 is an apocalyptic number.

It is an amenable number.

28477009 is a deficient number, since it is larger than the sum of its proper divisors (2588831).

28477009 is a wasteful number, since it uses less digits than its factorization.

28477009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588830.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28477009 is about 5336.3853871324. The cubic root of 28477009 is about 305.3735778915.

The spelling of 28477009 in words is "twenty-eight million, four hundred seventy-seven thousand, nine".