28785590771 has 16 divisors (see below), whose sum is σ = 33551988480. Its totient is φ = 24185150880.

The previous prime is 28785590747. The next prime is 28785590773. The reversal of 28785590771 is 17709558782.

It is a cyclic number.

It is not a de Polignac number, because 28785590771 - 2²⁶ = 28718481907 is a prime.

It is a super-2 number, since 2×28785590771² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28785590771.

It is not an unprimeable number, because it can be changed into a prime (28785590773) 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, 42881 + ... + 243741.

It is an arithmetic number, because the mean of its divisors is an integer number (2096999280).

Almost surely, 2^28785590771 is an apocalyptic number.

28785590771 is a deficient number, since it is larger than the sum of its proper divisors (4766397709).

28785590771 is a wasteful number, since it uses less digits than its factorization.

28785590771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201274.

The product of its (nonzero) digits is 9878400, while the sum is 59.

The spelling of 28785590771 in words is "twenty-eight billion, seven hundred eighty-five million, five hundred ninety thousand, seven hundred seventy-one".