28148136949186 has 4 divisors (see below), whose sum is σ = 42222205423782. Its totient is φ = 14074068474592.

The previous prime is 28148136949043. The next prime is 28148136949193. The reversal of 28148136949186 is 68194963184182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15860553165961 + 12287583783225 = 3982531^2 + 3505365^2 .

It is a super-2 number, since 2×28148136949186² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7037034237295 + ... + 7037034237298.

Almost surely, 2^{28148136949186} is an apocalyptic number.

28148136949186 is a deficient number, since it is larger than the sum of its proper divisors (14074068474596).

28148136949186 is a wasteful number, since it uses less digits than its factorization.

28148136949186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14074068474595.

The product of its digits is 143327232, while the sum is 70.

The spelling of 28148136949186 in words is "twenty-eight trillion, one hundred forty-eight billion, one hundred thirty-six million, nine hundred forty-nine thousand, one hundred eighty-six".