72911665 has 8 divisors (see below), whose sum is σ = 87557760. Its totient is φ = 58286832.

The previous prime is 72911651. The next prime is 72911677. The reversal of 72911665 is 56611927.

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

It is a cyclic number.

It is not a de Polignac number, because 72911665 - 2¹⁷ = 72780593 is a prime.

It is a super-2 number, since 2×72911665² = 10632221786144450, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3592 + ... + 12598.

It is an arithmetic number, because the mean of its divisors is an integer number (10944720).

Almost surely, 2^72911665 is an apocalyptic number.

It is an amenable number.

72911665 is a deficient number, since it is larger than the sum of its proper divisors (14646095).

72911665 is a wasteful number, since it uses less digits than its factorization.

72911665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631.

The product of its digits is 22680, while the sum is 37.

The square root of 72911665 is about 8538.8327656653. The cubic root of 72911665 is about 417.7652753733.

The spelling of 72911665 in words is "seventy-two million, nine hundred eleven thousand, six hundred sixty-five".