72706185 has 12 divisors (see below), whose sum is σ = 126024132. Its totient is φ = 38776608.

The previous prime is 72706181. The next prime is 72706187. The reversal of 72706185 is 58160727.

It can be written as a sum of positive squares in 2 ways, for example, as 53231616 + 19474569 = 7296^2 + 4413^2 .

It is not a de Polignac number, because 72706185 - 2² = 72706181 is a prime.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (72706181) 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 11 ways as a sum of consecutive naturals, for example, 807802 + ... + 807891.

It is an arithmetic number, because the mean of its divisors is an integer number (10502011).

Almost surely, 2^72706185 is an apocalyptic number.

It is an amenable number.

72706185 is a deficient number, since it is larger than the sum of its proper divisors (53317947).

72706185 is a wasteful number, since it uses less digits than its factorization.

72706185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615704 (or 1615701 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 72706185 is about 8526.7921869833. The cubic root of 72706185 is about 417.3724567675.

The spelling of 72706185 in words is "seventy-two million, seven hundred six thousand, one hundred eighty-five".