72687986810 has 16 divisors (see below), whose sum is σ = 138534751656. Its totient is φ = 27364889088.

The previous prime is 72687986779. The next prime is 72687986837. The reversal of 72687986810 is 1868978627.

It can be written as a sum of positive squares in 4 ways, for example, as 62934251689 + 9753735121 = 250867^2 + 98761^2 .

It is a super-2 number, since 2×72687986810² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 213788027 + ... + 213788366.

Almost surely, 2^72687986810 is an apocalyptic number.

72687986810 is a deficient number, since it is larger than the sum of its proper divisors (65846764846).

72687986810 is a wasteful number, since it uses less digits than its factorization.

72687986810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427576417.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 72687986810 in words is "seventy-two billion, six hundred eighty-seven million, nine hundred eighty-six thousand, eight hundred ten".