28881252745506 has 96 divisors (see below), whose sum is σ = 75983002767360. Its totient is φ = 7744421298528.

The previous prime is 28881252745459. The next prime is 28881252745531. The reversal of 28881252745506 is 60554725218882.

28881252745506 is a `hidden beast` number, since 2 + 8 + 8 + 8 + 1 + 2 + 5 + 2 + 74 + 550 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56117746 + ... + 56630061.

It is an arithmetic number, because the mean of its divisors is an integer number (791489612160).

Almost surely, 2^{28881252745506} is an apocalyptic number.

28881252745506 is an abundant number, since it is smaller than the sum of its proper divisors (47101750021854).

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

28881252745506 is a wasteful number, since it uses less digits than its factorization.

28881252745506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112747948 (or 112747945 counting only the distinct ones).

The product of its (nonzero) digits is 86016000, while the sum is 63.

The spelling of 28881252745506 in words is "twenty-eight trillion, eight hundred eighty-one billion, two hundred fifty-two million, seven hundred forty-five thousand, five hundred six".