72013665 has 8 divisors (see below), whose sum is σ = 115221888. Its totient is φ = 38407280.

The previous prime is 72013663. The next prime is 72013679. The reversal of 72013665 is 56631027.

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

It is not a de Polignac number, because 72013665 - 2¹ = 72013663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72013661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2400441 + ... + 2400470.

It is an arithmetic number, because the mean of its divisors is an integer number (14402736).

Almost surely, 2^72013665 is an apocalyptic number.

It is an amenable number.

72013665 is a deficient number, since it is larger than the sum of its proper divisors (43208223).

72013665 is a wasteful number, since it uses less digits than its factorization.

72013665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800919.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 72013665 is about 8486.0865538834. The cubic root of 72013665 is about 416.0430817839.

The spelling of 72013665 in words is "seventy-two million, thirteen thousand, six hundred sixty-five".