28709101513 has 4 divisors (see below), whose sum is σ = 28799666820. Its totient is φ = 28618536208.

The previous prime is 28709101439. The next prime is 28709101537. The reversal of 28709101513 is 31510190782.

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 14851809424 + 13857292089 = 121868^2 + 117717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28709101513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28709101583) 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, 45282178 + ... + 45282811.

It is an arithmetic number, because the mean of its divisors is an integer number (7199916705).

Almost surely, 2^28709101513 is an apocalyptic number.

It is an amenable number.

28709101513 is a deficient number, since it is larger than the sum of its proper divisors (90565307).

28709101513 is an equidigital number, since it uses as much as digits as its factorization.

28709101513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90565306.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 28709101513 in words is "twenty-eight billion, seven hundred nine million, one hundred one thousand, five hundred thirteen".