28561161469 has 4 divisors (see below), whose sum is σ = 28562562396. Its totient is φ = 28559760544.

The previous prime is 28561161449. The next prime is 28561161479. The reversal of 28561161469 is 96416116582.

It is a happy number.

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 18866396025 + 9694765444 = 137355^2 + 98462^2 .

It is a cyclic number.

It is not a de Polignac number, because 28561161469 - 2⁷ = 28561161341 is a prime.

It is a super-2 number, since 2×28561161469² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561161439) 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, 669424 + ... + 710809.

It is an arithmetic number, because the mean of its divisors is an integer number (7140640599).

Almost surely, 2^28561161469 is an apocalyptic number.

It is an amenable number.

28561161469 is a deficient number, since it is larger than the sum of its proper divisors (1400927).

28561161469 is a wasteful number, since it uses less digits than its factorization.

28561161469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400926.

The product of its digits is 622080, while the sum is 49.

The spelling of 28561161469 in words is "twenty-eight billion, five hundred sixty-one million, one hundred sixty-one thousand, four hundred sixty-nine".