28339237938 has 24 divisors (see below), whose sum is σ = 62299483344. Its totient is φ = 8587647640.

The previous prime is 28339237921. The next prime is 28339237939. The reversal of 28339237938 is 83973293382.

It is a happy number.

It is a super-2 number, since 2×28339237938² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28339237939) 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, 19516656 + ... + 19518107.

It is an arithmetic number, because the mean of its divisors is an integer number (2595811806).

Almost surely, 2^28339237938 is an apocalyptic number.

28339237938 is an abundant number, since it is smaller than the sum of its proper divisors (33960245406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28339237938 is a wasteful number, since it uses less digits than its factorization.

28339237938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39034790 (or 39034779 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 57.

The spelling of 28339237938 in words is "twenty-eight billion, three hundred thirty-nine million, two hundred thirty-seven thousand, nine hundred thirty-eight".