28372919281 has 12 divisors (see below), whose sum is σ = 33012120000. Its totient is φ = 24314570280.

The previous prime is 28372919231. The next prime is 28372919303. The reversal of 28372919281 is 18291927382.

It is a happy number.

It is not a de Polignac number, because 28372919281 - 2⁷ = 28372919153 is a prime.

It is a super-2 number, since 2×28372919281² (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 (28372919231) 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, 187036 + ... + 302866.

It is an arithmetic number, because the mean of its divisors is an integer number (2751010000).

Almost surely, 2^28372919281 is an apocalyptic number.

It is an amenable number.

28372919281 is a deficient number, since it is larger than the sum of its proper divisors (4639200719).

28372919281 is a wasteful number, since it uses less digits than its factorization.

28372919281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120844 (or 120837 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The spelling of 28372919281 in words is "twenty-eight billion, three hundred seventy-two million, nine hundred nineteen thousand, two hundred eighty-one".