28552512613 has 4 divisors (see below), whose sum is σ = 28814462380. Its totient is φ = 28290562848.

The previous prime is 28552512601. The next prime is 28552512623. The reversal of 28552512613 is 31621525582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31621525582 = 2 ⋅15810762791.

It can be written as a sum of positive squares in 2 ways, for example, as 15886585764 + 12665926849 = 126042^2 + 112543^2 .

It is a cyclic number.

It is not a de Polignac number, because 28552512613 - 2⁹ = 28552512101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28552512623) 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, 130974720 + ... + 130974937.

It is an arithmetic number, because the mean of its divisors is an integer number (7203615595).

Almost surely, 2^28552512613 is an apocalyptic number.

It is an amenable number.

28552512613 is a deficient number, since it is larger than the sum of its proper divisors (261949767).

28552512613 is a wasteful number, since it uses less digits than its factorization.

28552512613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261949766.

The product of its digits is 144000, while the sum is 40.

The spelling of 28552512613 in words is "twenty-eight billion, five hundred fifty-two million, five hundred twelve thousand, six hundred thirteen".