28157865650 has 12 divisors (see below), whose sum is σ = 52373630202. Its totient is φ = 11263146240.

The previous prime is 28157865611. The next prime is 28157865653. The reversal of 28157865650 is 5656875182.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 15780635641 + 12377230009 = 125621^2 + 111253^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28157865592 and 28157865601.

It is not an unprimeable number, because it can be changed into a prime (28157865653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281578607 + ... + 281578706.

Almost surely, 2^28157865650 is an apocalyptic number.

28157865650 is a deficient number, since it is larger than the sum of its proper divisors (24215764552).

28157865650 is a wasteful number, since it uses less digits than its factorization.

28157865650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563157325 (or 563157320 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 28157865650 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred sixty-five thousand, six hundred fifty".