28063391538 has 64 divisors (see below), whose sum is σ = 69583530240. Its totient is φ = 7347290112.

The previous prime is 28063391537. The next prime is 28063391561. The reversal of 28063391538 is 83519336082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28063391537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112783 + ... + 262386.

It is an arithmetic number, because the mean of its divisors is an integer number (1087242660).

Almost surely, 2^28063391538 is an apocalyptic number.

28063391538 is an abundant number, since it is smaller than the sum of its proper divisors (41520138702).

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

28063391538 is a wasteful number, since it uses less digits than its factorization.

28063391538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375331.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 28063391538 in words is "twenty-eight billion, sixty-three million, three hundred ninety-one thousand, five hundred thirty-eight".