28758620161 has 4 divisors (see below), whose sum is σ = 28784553300. Its totient is φ = 28732687024.

The previous prime is 28758620159. The next prime is 28758620183. The reversal of 28758620161 is 16102685782.

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 10824321600 + 17934298561 = 104040^2 + 133919^2 .

It is a cyclic number.

It is not a de Polignac number, because 28758620161 - 2¹ = 28758620159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28758620131) 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, 12964906 + ... + 12967123.

It is an arithmetic number, because the mean of its divisors is an integer number (7196138325).

Almost surely, 2^28758620161 is an apocalyptic number.

It is an amenable number.

28758620161 is a deficient number, since it is larger than the sum of its proper divisors (25933139).

28758620161 is a wasteful number, since it uses less digits than its factorization.

28758620161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25933138.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 28758620161 in words is "twenty-eight billion, seven hundred fifty-eight million, six hundred twenty thousand, one hundred sixty-one".