72873657865 has 16 divisors (see below), whose sum is σ = 88762631760. Its totient is φ = 57428627200.

The previous prime is 72873657839. The next prime is 72873657887. The reversal of 72873657865 is 56875637827.

It can be written as a sum of positive squares in 8 ways, for example, as 41441559184 + 31432098681 = 203572^2 + 177291^2 .

It is not a de Polignac number, because 72873657865 - 2²⁵ = 72840103433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72873657797 and 72873657806.

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 15 ways as a sum of consecutive naturals, for example, 266770 + ... + 465739.

It is an arithmetic number, because the mean of its divisors is an integer number (5547664485).

Almost surely, 2^72873657865 is an apocalyptic number.

It is an amenable number.

72873657865 is a deficient number, since it is larger than the sum of its proper divisors (15888973895).

72873657865 is a wasteful number, since it uses less digits than its factorization.

72873657865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732812.

The product of its digits is 118540800, while the sum is 64.

The spelling of 72873657865 in words is "seventy-two billion, eight hundred seventy-three million, six hundred fifty-seven thousand, eight hundred sixty-five".