28725518219 has 8 divisors (see below), whose sum is σ = 29777086560. Its totient is φ = 27678018816.

The previous prime is 28725518203. The next prime is 28725518221. The reversal of 28725518219 is 91281552782.

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 28725518219 - 2⁴ = 28725518203 is a prime.

It is a super-2 number, since 2×28725518219² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28725514219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002854 + ... + 1031099.

It is an arithmetic number, because the mean of its divisors is an integer number (3722135820).

Almost surely, 2^28725518219 is an apocalyptic number.

28725518219 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28725518219 is a deficient number, since it is larger than the sum of its proper divisors (1051568341).

28725518219 is a wasteful number, since it uses less digits than its factorization.

28725518219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034469.

The product of its digits is 806400, while the sum is 50.

The spelling of 28725518219 in words is "twenty-eight billion, seven hundred twenty-five million, five hundred eighteen thousand, two hundred nineteen".