72416665 has 4 divisors (see below), whose sum is σ = 86900004. Its totient is φ = 57933328.

The previous prime is 72416653. The next prime is 72416671. The reversal of 72416665 is 56661427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10259209 + 62157456 = 3203^2 + 7884^2 .

It is a cyclic number.

It is not a de Polignac number, because 72416665 - 2⁹ = 72416153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7241662 + ... + 7241671.

It is an arithmetic number, because the mean of its divisors is an integer number (21725001).

Almost surely, 2^72416665 is an apocalyptic number.

It is an amenable number.

72416665 is a deficient number, since it is larger than the sum of its proper divisors (14483339).

72416665 is a wasteful number, since it uses less digits than its factorization.

72416665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14483338.

The product of its digits is 60480, while the sum is 37.

The square root of 72416665 is about 8509.7981762202. The cubic root of 72416665 is about 416.8177198102.

The spelling of 72416665 in words is "seventy-two million, four hundred sixteen thousand, six hundred sixty-five".