72166330 has 8 divisors (see below), whose sum is σ = 129899412. Its totient is φ = 28866528.

The previous prime is 72166319. The next prime is 72166331. The reversal of 72166330 is 3366127.

It can be written as a sum of positive squares in 2 ways, for example, as 71250481 + 915849 = 8441^2 + 957^2 .

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 (72166331) 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, 3608307 + ... + 3608326.

Almost surely, 2^72166330 is an apocalyptic number.

72166330 is a deficient number, since it is larger than the sum of its proper divisors (57733082).

72166330 is a wasteful number, since it uses less digits than its factorization.

72166330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7216640.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 72166330 is about 8495.0768095409. The cubic root of 72166330 is about 416.3368704093.

The spelling of 72166330 in words is "seventy-two million, one hundred sixty-six thousand, three hundred thirty".