28157724717 has 8 divisors (see below), whose sum is σ = 37629155520. Its totient is φ = 18729055200.

The previous prime is 28157724703. The next prime is 28157724739. The reversal of 28157724717 is 71742775182.

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

It is not a de Polignac number, because 28157724717 - 2¹⁵ = 28157691949 is a prime.

It is a super-2 number, since 2×28157724717² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28157724717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157724757) 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, 10688784 + ... + 10691417.

It is an arithmetic number, because the mean of its divisors is an integer number (4703644440).

Almost surely, 2^28157724717 is an apocalyptic number.

It is an amenable number.

28157724717 is a deficient number, since it is larger than the sum of its proper divisors (9471430803).

28157724717 is a wasteful number, since it uses less digits than its factorization.

28157724717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380643.

The product of its digits is 1536640, while the sum is 51.

The spelling of 28157724717 in words is "twenty-eight billion, one hundred fifty-seven million, seven hundred twenty-four thousand, seven hundred seventeen".