72687205 has 4 divisors (see below), whose sum is σ = 87224652. Its totient is φ = 58149760.

The previous prime is 72687191. The next prime is 72687211. The reversal of 72687205 is 50278627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50278627 = 7 ⋅7182661.

It can be written as a sum of positive squares in 2 ways, for example, as 18267076 + 54420129 = 4274^2 + 7377^2 .

It is not a de Polignac number, because 72687205 - 2⁷ = 72687077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 7268716 + ... + 7268725.

It is an arithmetic number, because the mean of its divisors is an integer number (21806163).

Almost surely, 2^72687205 is an apocalyptic number.

It is an amenable number.

72687205 is a deficient number, since it is larger than the sum of its proper divisors (14537447).

72687205 is a wasteful number, since it uses less digits than its factorization.

72687205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14537446.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 72687205 is about 8525.6791518330. The cubic root of 72687205 is about 417.3361351504.

The spelling of 72687205 in words is "seventy-two million, six hundred eighty-seven thousand, two hundred five".