28029881007501 has 32 divisors (see below), whose sum is σ = 41678008593408. Its totient is φ = 16665486140160.

The previous prime is 28029881007497. The next prime is 28029881007523. The reversal of 28029881007501 is 10570018892082.

It is not a de Polignac number, because 28029881007501 - 2² = 28029881007497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28029881007101) 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, 111537535 + ... + 111788556.

It is an arithmetic number, because the mean of its divisors is an integer number (1302437768544).

Almost surely, 2^{28029881007501} is an apocalyptic number.

It is an amenable number.

28029881007501 is a deficient number, since it is larger than the sum of its proper divisors (13648127585907).

28029881007501 is a wasteful number, since it uses less digits than its factorization.

28029881007501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223326241.

The product of its (nonzero) digits is 645120, while the sum is 51.

Adding to 28029881007501 its reverse (10570018892082), we get a palindrome (38599899899583).

The spelling of 28029881007501 in words is "twenty-eight trillion, twenty-nine billion, eight hundred eighty-one million, seven thousand, five hundred one".