28056123538 has 8 divisors (see below), whose sum is σ = 42114057660. Its totient is φ = 14018104320.

The previous prime is 28056123517. The next prime is 28056123569. The reversal of 28056123538 is 83532165082.

It can be written as a sum of positive squares in 2 ways, for example, as 25923254049 + 2132869489 = 161007^2 + 46183^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28056123494 and 28056123503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4975203 + ... + 4980838.

Almost surely, 2^28056123538 is an apocalyptic number.

28056123538 is a deficient number, since it is larger than the sum of its proper divisors (14057934122).

28056123538 is a wasteful number, since it uses less digits than its factorization.

28056123538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9957452.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 28056123538 in words is "twenty-eight billion, fifty-six million, one hundred twenty-three thousand, five hundred thirty-eight".