72309706 has 16 divisors (see below), whose sum is σ = 130484160. Its totient is φ = 29358720.

The previous prime is 72309667. The next prime is 72309709. The reversal of 72309706 is 60790327.

72309706 is nontrivially palindromic in base 13.

It is not an unprimeable number, because it can be changed into a prime (72309709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135655 + ... + 136186.

It is an arithmetic number, because the mean of its divisors is an integer number (8155260).

Almost surely, 2^72309706 is an apocalyptic number.

72309706 is a deficient number, since it is larger than the sum of its proper divisors (58174454).

72309706 is a wasteful number, since it uses less digits than its factorization.

72309706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271869.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 72309706 is about 8503.5113923602. The cubic root of 72309706 is about 416.6124062320.

The spelling of 72309706 in words is "seventy-two million, three hundred nine thousand, seven hundred six".