28861331238 has 64 divisors (see below), whose sum is σ = 64475755200. Its totient is φ = 9569664000.

The previous prime is 28861331237. The next prime is 28861331263. The reversal of 28861331238 is 83213316882.

28861331238 is a `hidden beast` number, since 2 + 8 + 8 + 613 + 3 + 1 + 23 + 8 = 666.

It is a super-2 number, since 2×28861331238² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28861331193 and 28861331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861331237) 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, 9615738 + ... + 9618738.

It is an arithmetic number, because the mean of its divisors is an integer number (1007433675).

Almost surely, 2^28861331238 is an apocalyptic number.

28861331238 is an abundant number, since it is smaller than the sum of its proper divisors (35614423962).

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

28861331238 is a wasteful number, since it uses less digits than its factorization.

28861331238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894 (or 3888 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 28861331238 in words is "twenty-eight billion, eight hundred sixty-one million, three hundred thirty-one thousand, two hundred thirty-eight".