28810013761 has 4 divisors (see below), whose sum is σ = 29095261524. Its totient is φ = 28524766000.

The previous prime is 28810013737. The next prime is 28810013767. The reversal of 28810013761 is 16731001882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17439843600 + 11370170161 = 132060^2 + 106631^2 .

It is a cyclic number.

It is not a de Polignac number, because 28810013761 - 2¹³ = 28810005569 is a prime.

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 28810013761.

It is not an unprimeable number, because it can be changed into a prime (28810013767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142623730 + ... + 142623931.

It is an arithmetic number, because the mean of its divisors is an integer number (7273815381).

Almost surely, 2^28810013761 is an apocalyptic number.

It is an amenable number.

28810013761 is a deficient number, since it is larger than the sum of its proper divisors (285247763).

28810013761 is a wasteful number, since it uses less digits than its factorization.

28810013761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285247762.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 28810013761 in words is "twenty-eight billion, eight hundred ten million, thirteen thousand, seven hundred sixty-one".