28057730405 has 8 divisors (see below), whose sum is σ = 34830286200. Its totient is φ = 21672177856.

The previous prime is 28057730401. The next prime is 28057730417. The reversal of 28057730405 is 50403775082.

It can be written as a sum of positive squares in 4 ways, for example, as 9224834116 + 18832896289 = 96046^2 + 137233^2 .

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 28057730405 - 2² = 28057730401 is a prime.

It is a super-2 number, since 2×28057730405² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057730401) 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, 96750650 + ... + 96750939.

It is an arithmetic number, because the mean of its divisors is an integer number (4353785775).

Almost surely, 2^28057730405 is an apocalyptic number.

It is an amenable number.

28057730405 is a deficient number, since it is larger than the sum of its proper divisors (6772555795).

28057730405 is a wasteful number, since it uses less digits than its factorization.

28057730405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193501623.

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 28057730405 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, four hundred five".