28046047861 has 4 divisors (see below), whose sum is σ = 30203436172. Its totient is φ = 25888659552.

The previous prime is 28046047849. The next prime is 28046047919. The reversal of 28046047861 is 16874064082.

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 2211914961 + 25834132900 = 47031^2 + 160730^2 .

It is a cyclic number.

It is not a de Polignac number, because 28046047861 - 2¹⁵ = 28046015093 is a prime.

It is a super-3 number, since 3×28046047861³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28046047831) 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, 1078694136 + ... + 1078694161.

It is an arithmetic number, because the mean of its divisors is an integer number (7550859043).

Almost surely, 2^28046047861 is an apocalyptic number.

It is an amenable number.

28046047861 is a deficient number, since it is larger than the sum of its proper divisors (2157388311).

28046047861 is a wasteful number, since it uses less digits than its factorization.

28046047861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157388310.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 28046047861 in words is "twenty-eight billion, forty-six million, forty-seven thousand, eight hundred sixty-one".