28154575861 has 8 divisors (see below), whose sum is σ = 28678748760. Its totient is φ = 27635021568.

The previous prime is 28154575781. The next prime is 28154575873. The reversal of 28154575861 is 16857545182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1366706961 + 26787868900 = 36969^2 + 163670^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28154575861 - 2¹¹ = 28154573813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28154575799 and 28154575808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28154575661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142346 + ... + 1166731.

It is an arithmetic number, because the mean of its divisors is an integer number (3584843595).

Almost surely, 2^28154575861 is an apocalyptic number.

It is an amenable number.

28154575861 is a deficient number, since it is larger than the sum of its proper divisors (524172899).

28154575861 is a wasteful number, since it uses less digits than its factorization.

28154575861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309303.

The product of its digits is 2688000, while the sum is 52.

The spelling of 28154575861 in words is "twenty-eight billion, one hundred fifty-four million, five hundred seventy-five thousand, eight hundred sixty-one".