28872734261 has 16 divisors (see below), whose sum is σ = 35091037440. Its totient is φ = 23190554880.

The previous prime is 28872734251. The next prime is 28872734287. The reversal of 28872734261 is 16243727882.

It is a cyclic number.

It is not a de Polignac number, because 28872734261 - 2³⁰ = 27798992437 is a prime.

It is a super-2 number, since 2×28872734261² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28872734201) 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, 502505 + ... + 557006.

It is an arithmetic number, because the mean of its divisors is an integer number (2193189840).

Almost surely, 2^28872734261 is an apocalyptic number.

It is an amenable number.

28872734261 is a deficient number, since it is larger than the sum of its proper divisors (6218303179).

28872734261 is a wasteful number, since it uses less digits than its factorization.

28872734261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059764.

The product of its digits is 1806336, while the sum is 50.

The spelling of 28872734261 in words is "twenty-eight billion, eight hundred seventy-two million, seven hundred thirty-four thousand, two hundred sixty-one".