72017666 has 8 divisors (see below), whose sum is σ = 123458880. Its totient is φ = 30864708.

The previous prime is 72017663. The next prime is 72017711. The reversal of 72017666 is 66671027.

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 (72017663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572046 + ... + 2572073.

It is an arithmetic number, because the mean of its divisors is an integer number (15432360).

Almost surely, 2^72017666 is an apocalyptic number.

72017666 is a deficient number, since it is larger than the sum of its proper divisors (51441214).

72017666 is a wasteful number, since it uses less digits than its factorization.

72017666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144128.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 72017666 is about 8486.3222894255. The cubic root of 72017666 is about 416.0507866065.

The spelling of 72017666 in words is "seventy-two million, seventeen thousand, six hundred sixty-six".