28702324261 has 4 divisors (see below), whose sum is σ = 30910195372. Its totient is φ = 26494453152.

The previous prime is 28702324213. The next prime is 28702324267. The reversal of 28702324261 is 16242320782.

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 10101456036 + 18600868225 = 100506^2 + 136385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28702324261 is a prime.

It is a super-2 number, since 2×28702324261² (a number of 22 digits) contains 22 as substring.

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 28702324261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28702324267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103935536 + ... + 1103935561.

It is an arithmetic number, because the mean of its divisors is an integer number (7727548843).

Almost surely, 2^28702324261 is an apocalyptic number.

It is an amenable number.

28702324261 is a deficient number, since it is larger than the sum of its proper divisors (2207871111).

28702324261 is a wasteful number, since it uses less digits than its factorization.

28702324261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207871110.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 28702324261 in words is "twenty-eight billion, seven hundred two million, three hundred twenty-four thousand, two hundred sixty-one".