72684085 has 4 divisors (see below), whose sum is σ = 87220908. Its totient is φ = 58147264.

The previous prime is 72684083. The next prime is 72684091. The reversal of 72684085 is 58048627.

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 45037521 + 27646564 = 6711^2 + 5258^2 .

It is a cyclic number.

It is not a de Polignac number, because 72684085 - 2¹ = 72684083 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72684083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7268404 + ... + 7268413.

It is an arithmetic number, because the mean of its divisors is an integer number (21805227).

Almost surely, 2^72684085 is an apocalyptic number.

It is an amenable number.

72684085 is a deficient number, since it is larger than the sum of its proper divisors (14536823).

72684085 is a wasteful number, since it uses less digits than its factorization.

72684085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14536822.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 72684085 is about 8525.4961732441. The cubic root of 72684085 is about 417.3301638685.

The spelling of 72684085 in words is "seventy-two million, six hundred eighty-four thousand, eighty-five".