28356539236 has 27 divisors (see below), whose sum is σ = 49968748011. Its totient is φ = 14080432704.

The previous prime is 28356539221. The next prime is 28356539249. The reversal of 28356539236 is 63293565382.

It is a happy number.

The square root of 28356539236 is 168394.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 25214264100 + 3142275136 = 158790^2 + 56056^2 .

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 90595816 + ... + 90596128.

Almost surely, 2^28356539236 is an apocalyptic number.

28356539236 is the 168394-th square number.

It is an amenable number.

28356539236 is a deficient number, since it is larger than the sum of its proper divisors (21612208775).

28356539236 is an frugal number, since it uses more digits than its factorization.

28356539236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 584 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 52.

The spelling of 28356539236 in words is "twenty-eight billion, three hundred fifty-six million, five hundred thirty-nine thousand, two hundred thirty-six".