28881056838 has 64 divisors (see below), whose sum is σ = 58861716480. Its totient is φ = 9445911552.

The previous prime is 28881056807. The next prime is 28881056839. The reversal of 28881056838 is 83865018882.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881056839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55221645 + ... + 55222167.

It is an arithmetic number, because the mean of its divisors is an integer number (919714320).

Almost surely, 2^28881056838 is an apocalyptic number.

28881056838 is an abundant number, since it is smaller than the sum of its proper divisors (29980659642).

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

28881056838 is a wasteful number, since it uses less digits than its factorization.

28881056838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261.

The product of its (nonzero) digits is 5898240, while the sum is 57.

The spelling of 28881056838 in words is "twenty-eight billion, eight hundred eighty-one million, fifty-six thousand, eight hundred thirty-eight".