64506189720 has 128 divisors (see below), whose sum is σ = 224789898240. Its totient is φ = 14502551040.

The previous prime is 64506189697. The next prime is 64506189757. The reversal of 64506189720 is 2798160546.

It is a super-2 number, since 2×64506189720² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64506189720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578212 + ... + 680691.

It is an arithmetic number, because the mean of its divisors is an integer number (1756171080).

Almost surely, 2^64506189720 is an apocalyptic number.

64506189720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64506189720 is an abundant number, since it is smaller than the sum of its proper divisors (160283708520).

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

64506189720 is a wasteful number, since it uses less digits than its factorization.

64506189720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258985 (or 1258981 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 64506189720 in words is "sixty-four billion, five hundred six million, one hundred eighty-nine thousand, seven hundred twenty".