72851689 has 4 divisors (see below), whose sum is σ = 73084756. Its totient is φ = 72618624.

The previous prime is 72851687. The next prime is 72851717. The reversal of 72851689 is 98615827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7371225 + 65480464 = 2715^2 + 8092^2 .

It is a cyclic number.

It is not a de Polignac number, because 72851689 - 2¹ = 72851687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72851687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116064 + ... + 116689.

It is an arithmetic number, because the mean of its divisors is an integer number (18271189).

Almost surely, 2^72851689 is an apocalyptic number.

It is an amenable number.

72851689 is a deficient number, since it is larger than the sum of its proper divisors (233067).

72851689 is a wasteful number, since it uses less digits than its factorization.

72851689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233066.

The product of its digits is 241920, while the sum is 46.

The square root of 72851689 is about 8535.3200877296. The cubic root of 72851689 is about 417.6506948807.

The spelling of 72851689 in words is "seventy-two million, eight hundred fifty-one thousand, six hundred eighty-nine".