28715478545 has 8 divisors (see below), whose sum is σ = 37109233896. Its totient is φ = 21205276416.

The previous prime is 28715478523. The next prime is 28715478551. The reversal of 28715478545 is 54587451782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3296597056 + 25418881489 = 57416^2 + 159433^2 .

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 28715478545 - 2¹⁶ = 28715413009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220888232 + ... + 220888361.

It is an arithmetic number, because the mean of its divisors is an integer number (4638654237).

Almost surely, 2^28715478545 is an apocalyptic number.

It is an amenable number.

28715478545 is a deficient number, since it is larger than the sum of its proper divisors (8393755351).

28715478545 is a wasteful number, since it uses less digits than its factorization.

28715478545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441776611.

The product of its digits is 12544000, while the sum is 56.

The spelling of 28715478545 in words is "twenty-eight billion, seven hundred fifteen million, four hundred seventy-eight thousand, five hundred forty-five".