72990706 has 8 divisors (see below), whose sum is σ = 109941084. Its totient is φ = 36343680.

The previous prime is 72990703. The next prime is 72990721. The reversal of 72990706 is 60709927.

It can be written as a sum of positive squares in 2 ways, for example, as 72948681 + 42025 = 8541^2 + 205^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (72990703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75235 + ... + 76198.

Almost surely, 2^72990706 is an apocalyptic number.

72990706 is a deficient number, since it is larger than the sum of its proper divisors (36950378).

72990706 is a wasteful number, since it uses less digits than its factorization.

72990706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151676.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 72990706 is about 8543.4598377941. The cubic root of 72990706 is about 417.9161824568.

The spelling of 72990706 in words is "seventy-two million, nine hundred ninety thousand, seven hundred six".