64186344642728 has 96 divisors (see below), whose sum is σ = 154299882925440. Its totient is φ = 24749855585280.

The previous prime is 64186344642701. The next prime is 64186344642757. The reversal of 64186344642728 is 82724644368146.

It is a happy number.

It is a super-3 number, since 3×64186344642728³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76311200 + ... + 77147727.

It is an arithmetic number, because the mean of its divisors is an integer number (1607290447140).

Almost surely, 2^{64186344642728} is an apocalyptic number.

It is an amenable number.

64186344642728 is an abundant number, since it is smaller than the sum of its proper divisors (90113538282712).

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

64186344642728 is a wasteful number, since it uses less digits than its factorization.

64186344642728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153459055 (or 153459044 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 65.

The spelling of 64186344642728 in words is "sixty-four trillion, one hundred eighty-six billion, three hundred forty-four million, six hundred forty-two thousand, seven hundred twenty-eight".