28128734461 has 8 divisors (see below), whose sum is σ = 29038482944. Its totient is φ = 27219134160.

The previous prime is 28128734437. The next prime is 28128734477. The reversal of 28128734461 is 16443782182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28128734461 - 2¹⁵ = 28128701693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128734401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451000 + ... + 509566.

It is an arithmetic number, because the mean of its divisors is an integer number (3629810368).

Almost surely, 2^28128734461 is an apocalyptic number.

It is an amenable number.

28128734461 is a deficient number, since it is larger than the sum of its proper divisors (909748483).

28128734461 is a wasteful number, since it uses less digits than its factorization.

28128734461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74091.

The product of its digits is 516096, while the sum is 46.

The spelling of 28128734461 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred thirty-four thousand, four hundred sixty-one".