28545072515 has 16 divisors (see below), whose sum is σ = 34375404000. Its totient is φ = 22755313152.

The previous prime is 28545072511. The next prime is 28545072529. The reversal of 28545072515 is 51527054582.

It is a cyclic number.

It is not a de Polignac number, because 28545072515 - 2² = 28545072511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28545072511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1852061 + ... + 1867409.

It is an arithmetic number, because the mean of its divisors is an integer number (2148462750).

Almost surely, 2^28545072515 is an apocalyptic number.

28545072515 is a deficient number, since it is larger than the sum of its proper divisors (5830331485).

28545072515 is a wasteful number, since it uses less digits than its factorization.

28545072515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16646.

The product of its (nonzero) digits is 560000, while the sum is 44.

The spelling of 28545072515 in words is "twenty-eight billion, five hundred forty-five million, seventy-two thousand, five hundred fifteen".