28356322506 has 32 divisors (see below), whose sum is σ = 58202072448. Its totient is φ = 9206879040.

The previous prime is 28356322499. The next prime is 28356322537. The reversal of 28356322506 is 60522365382.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338401 + ... + 413796.

It is an arithmetic number, because the mean of its divisors is an integer number (1818814764).

Almost surely, 2^28356322506 is an apocalyptic number.

28356322506 is an abundant number, since it is smaller than the sum of its proper divisors (29845749942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28356322506 is a wasteful number, since it uses less digits than its factorization.

28356322506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752366.

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 28356322506 its reverse (60522365382), we get a palindrome (88878687888).

The spelling of 28356322506 in words is "twenty-eight billion, three hundred fifty-six million, three hundred twenty-two thousand, five hundred six".