72786313 has 4 divisors (see below), whose sum is σ = 72829588. Its totient is φ = 72743040.

The previous prime is 72786293. The next prime is 72786341. The reversal of 72786313 is 31368727.

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 28590409 + 44195904 = 5347^2 + 6648^2 .

It is a cyclic number.

It is not a de Polignac number, because 72786313 - 2⁵ = 72786281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72783313) 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, 19008 + ... + 22513.

It is an arithmetic number, because the mean of its divisors is an integer number (18207397).

Almost surely, 2^72786313 is an apocalyptic number.

It is an amenable number.

72786313 is a deficient number, since it is larger than the sum of its proper divisors (43275).

72786313 is a wasteful number, since it uses less digits than its factorization.

72786313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43274.

The product of its digits is 42336, while the sum is 37.

The square root of 72786313 is about 8531.4894948069. The cubic root of 72786313 is about 417.5257263600.

The spelling of 72786313 in words is "seventy-two million, seven hundred eighty-six thousand, three hundred thirteen".