28881238031 has 16 divisors (see below), whose sum is σ = 29572452000. Its totient is φ = 28197187200.

The previous prime is 28881238003. The next prime is 28881238063. The reversal of 28881238031 is 13083218882.

It is a cyclic number.

It is not a de Polignac number, because 28881238031 - 2¹⁸ = 28880975887 is a prime.

It is a super-2 number, since 2×28881238031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881258031) 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 15 ways as a sum of consecutive naturals, for example, 11329145 + ... + 11331693.

It is an arithmetic number, because the mean of its divisors is an integer number (1848278250).

Almost surely, 2^28881238031 is an apocalyptic number.

28881238031 is a deficient number, since it is larger than the sum of its proper divisors (691213969).

28881238031 is a wasteful number, since it uses less digits than its factorization.

28881238031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850.

The product of its (nonzero) digits is 147456, while the sum is 44.

The spelling of 28881238031 in words is "twenty-eight billion, eight hundred eighty-one million, two hundred thirty-eight thousand, thirty-one".