72223665 has 8 divisors (see below), whose sum is σ = 115557888. Its totient is φ = 38519280.

The previous prime is 72223661. The next prime is 72223681. The reversal of 72223665 is 56632227.

It is a happy number.

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

It is not a de Polignac number, because 72223665 - 2² = 72223661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72223661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407441 + ... + 2407470.

It is an arithmetic number, because the mean of its divisors is an integer number (14444736).

Almost surely, 2^72223665 is an apocalyptic number.

It is an amenable number.

72223665 is a deficient number, since it is larger than the sum of its proper divisors (43334223).

72223665 is a wasteful number, since it uses less digits than its factorization.

72223665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4814919.

The product of its digits is 30240, while the sum is 33.

The square root of 72223665 is about 8498.4507411645. The cubic root of 72223665 is about 416.4470988941.

The spelling of 72223665 in words is "seventy-two million, two hundred twenty-three thousand, six hundred sixty-five".