72709066 has 8 divisors (see below), whose sum is σ = 110188260. Its totient is φ = 35979648.

The previous prime is 72709037. The next prime is 72709069. The reversal of 72709066 is 66090727.

It can be written as a sum of positive squares in 2 ways, for example, as 67322025 + 5387041 = 8205^2 + 2321^2 .

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 (72709069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187201 + ... + 187588.

Almost surely, 2^72709066 is an apocalyptic number.

72709066 is a deficient number, since it is larger than the sum of its proper divisors (37479194).

72709066 is a wasteful number, since it uses less digits than its factorization.

72709066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374888.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 72709066 is about 8526.9611234015. The cubic root of 72709066 is about 417.3779695226.

The spelling of 72709066 in words is "seventy-two million, seven hundred nine thousand, sixty-six".