28378637838 has 24 divisors (see below), whose sum is σ = 61492563288. Its totient is φ = 9458697552.

The previous prime is 28378637779. The next prime is 28378637843. The reversal of 28378637838 is 83873687382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155056 + ... + 284252.

It is an arithmetic number, because the mean of its divisors is an integer number (2562190137).

Almost surely, 2^28378637838 is an apocalyptic number.

28378637838 is an abundant number, since it is smaller than the sum of its proper divisors (33113925450).

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

28378637838 is a wasteful number, since it uses less digits than its factorization.

28378637838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141408 (or 141405 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 63.

The spelling of 28378637838 in words is "twenty-eight billion, three hundred seventy-eight million, six hundred thirty-seven thousand, eight hundred thirty-eight".