28941857281 has 16 divisors (see below), whose sum is σ = 30755635200. Its totient is φ = 27140604928.

The previous prime is 28941857251. The next prime is 28941857299. The reversal of 28941857281 is 18275814982.

It is a cyclic number.

It is not a de Polignac number, because 28941857281 - 2⁵ = 28941857249 is a prime.

It is a super-2 number, since 2×28941857281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28941857251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9367785 + ... + 9370873.

It is an arithmetic number, because the mean of its divisors is an integer number (1922227200).

Almost surely, 2^28941857281 is an apocalyptic number.

It is an amenable number.

28941857281 is a deficient number, since it is larger than the sum of its proper divisors (1813777919).

28941857281 is a wasteful number, since it uses less digits than its factorization.

28941857281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928.

The product of its digits is 2580480, while the sum is 55.

The spelling of 28941857281 in words is "twenty-eight billion, nine hundred forty-one million, eight hundred fifty-seven thousand, two hundred eighty-one".