72428318660 has 12 divisors (see below), whose sum is σ = 152099469228. Its totient is φ = 28971327456.

The previous prime is 72428318657. The next prime is 72428318681. The reversal of 72428318660 is 6681382427.

It can be written as a sum of positive squares in 2 ways, for example, as 46843676356 + 25584642304 = 216434^2 + 159952^2 .

It is a super-2 number, since 2×72428318660² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1810707947 + ... + 1810707986.

It is an arithmetic number, because the mean of its divisors is an integer number (12674955769).

Almost surely, 2^72428318660 is an apocalyptic number.

It is an amenable number.

72428318660 is an abundant number, since it is smaller than the sum of its proper divisors (79671150568).

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

72428318660 is a wasteful number, since it uses less digits than its factorization.

72428318660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621415942 (or 3621415940 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 72428318660 in words is "seventy-two billion, four hundred twenty-eight million, three hundred eighteen thousand, six hundred sixty".