28181979937837 has 48 divisors (see below), whose sum is σ = 31977518307840. Its totient is φ = 24630067548000.

The previous prime is 28181979937721. The next prime is 28181979937847. The reversal of 28181979937837 is 73873997918182.

It is not a de Polignac number, because 28181979937837 - 2²³ = 28181971549229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28181979937847) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2011411162 + ... + 2011425172.

It is an arithmetic number, because the mean of its divisors is an integer number (666198298080).

Almost surely, 2^{28181979937837} is an apocalyptic number.

It is an amenable number.

28181979937837 is a deficient number, since it is larger than the sum of its proper divisors (3795538370003).

28181979937837 is a wasteful number, since it uses less digits than its factorization.

28181979937837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15326 (or 15295 counting only the distinct ones).

The product of its digits is 2304433152, while the sum is 82.

The spelling of 28181979937837 in words is "twenty-eight trillion, one hundred eighty-one billion, nine hundred seventy-nine million, nine hundred thirty-seven thousand, eight hundred thirty-seven".