28781450215 has 12 divisors (see below), whose sum is σ = 40176555336. Its totient is φ = 19735851408.

The previous prime is 28781450213. The next prime is 28781450219. The reversal of 28781450215 is 51205418782.

It is not a de Polignac number, because 28781450215 - 2¹ = 28781450213 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 (28781450213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58737409 + ... + 58737898.

It is an arithmetic number, because the mean of its divisors is an integer number (3348046278).

Almost surely, 2^28781450215 is an apocalyptic number.

28781450215 is a deficient number, since it is larger than the sum of its proper divisors (11395105121).

28781450215 is a wasteful number, since it uses less digits than its factorization.

28781450215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117475326 (or 117475319 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 43.

Adding to 28781450215 its reverse (51205418782), we get a palindrome (79986868997).

The spelling of 28781450215 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred fifty thousand, two hundred fifteen".