28381378530 has 16 divisors (see below), whose sum is σ = 68115308544. Its totient is φ = 7568367600.

The previous prime is 28381378523. The next prime is 28381378541. The reversal of 28381378530 is 3587318382.

It is a self number, because there is not a number n which added to its sum of digits gives 28381378530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473022946 + ... + 473023005.

It is an arithmetic number, because the mean of its divisors is an integer number (4257206784).

Almost surely, 2^28381378530 is an apocalyptic number.

28381378530 is an abundant number, since it is smaller than the sum of its proper divisors (39733930014).

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

28381378530 is a wasteful number, since it uses less digits than its factorization.

28381378530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946045961.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 28381378530 in words is "twenty-eight billion, three hundred eighty-one million, three hundred seventy-eight thousand, five hundred thirty".