186436542728 has 8 divisors (see below), whose sum is σ = 349568517630. Its totient is φ = 93218271360.

The previous prime is 186436542727. The next prime is 186436542757. The reversal of 186436542728 is 827245634681.

It can be written as a sum of positive squares in only one way, i.e., 138695166724 + 47741376004 = 372418^2 + 218498^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (186436542727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11652283913 + ... + 11652283928.

Almost surely, 2^186436542728 is an apocalyptic number.

It is an amenable number.

186436542728 is a deficient number, since it is larger than the sum of its proper divisors (163131974902).

186436542728 is a wasteful number, since it uses less digits than its factorization.

186436542728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23304567847 (or 23304567843 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 56.

The spelling of 186436542728 in words is "one hundred eighty-six billion, four hundred thirty-six million, five hundred forty-two thousand, seven hundred twenty-eight".