28121701502 has 16 divisors (see below), whose sum is σ = 44026398720. Its totient is φ = 13446508152.

The previous prime is 28121701501. The next prime is 28121701511. The reversal of 28121701502 is 20510712182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121701501) 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 7 ways as a sum of consecutive naturals, for example, 147503 + ... + 279285.

It is an arithmetic number, because the mean of its divisors is an integer number (2751649920).

Almost surely, 2^28121701502 is an apocalyptic number.

28121701502 is a deficient number, since it is larger than the sum of its proper divisors (15904697218).

28121701502 is a wasteful number, since it uses less digits than its factorization.

28121701502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136447.

The product of its (nonzero) digits is 2240, while the sum is 29.

The spelling of 28121701502 in words is "twenty-eight billion, one hundred twenty-one million, seven hundred one thousand, five hundred two".