72518786 has 4 divisors (see below), whose sum is σ = 108778182. Its totient is φ = 36259392.

The previous prime is 72518783. The next prime is 72518837. The reversal of 72518786 is 68781527.

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

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 5851561 = 8165^2 + 2419^2 .

It is not an unprimeable number, because it can be changed into a prime (72518783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18129695 + ... + 18129698.

Almost surely, 2^72518786 is an apocalyptic number.

72518786 is a deficient number, since it is larger than the sum of its proper divisors (36259396).

72518786 is a wasteful number, since it uses less digits than its factorization.

72518786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36259395.

The product of its digits is 188160, while the sum is 44.

The square root of 72518786 is about 8515.7962634154. The cubic root of 72518786 is about 417.0135580170.

The spelling of 72518786 in words is "seventy-two million, five hundred eighteen thousand, seven hundred eighty-six".