28045540509 has 16 divisors (see below), whose sum is σ = 45249948288. Its totient is φ = 15083315712.

The previous prime is 28045540507. The next prime is 28045540511. The reversal of 28045540509 is 90504554082.

It is an interprime number because it is at equal distance from previous prime (28045540507) and next prime (28045540511).

It is not a de Polignac number, because 28045540509 - 2¹ = 28045540507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045540507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39279112 + ... + 39279825.

It is an arithmetic number, because the mean of its divisors is an integer number (2828121768).

Almost surely, 2^28045540509 is an apocalyptic number.

It is an amenable number.

28045540509 is a deficient number, since it is larger than the sum of its proper divisors (17204407779).

28045540509 is a wasteful number, since it uses less digits than its factorization.

28045540509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78558964.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 28045540509 in words is "twenty-eight billion, forty-five million, five hundred forty thousand, five hundred nine".