72223664 has 10 divisors (see below), whose sum is σ = 139933380. Its totient is φ = 36111824.

The previous prime is 72223661. The next prime is 72223681. The reversal of 72223664 is 46632227.

It is a self number, because there is not a number n which added to its sum of digits gives 72223664.

It is not an unprimeable number, because it can be changed into a prime (72223661) 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 as a sum of consecutive naturals, namely, 2256974 + ... + 2257005.

It is an arithmetic number, because the mean of its divisors is an integer number (13993338).

Almost surely, 2^72223664 is an apocalyptic number.

It is an amenable number.

72223664 is a deficient number, since it is larger than the sum of its proper divisors (67709716).

72223664 is a wasteful number, since it uses less digits than its factorization.

72223664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513987 (or 4513981 counting only the distinct ones).

The product of its digits is 24192, while the sum is 32.

The square root of 72223664 is about 8498.4506823303. The cubic root of 72223664 is about 416.4470969721.

The spelling of 72223664 in words is "seventy-two million, two hundred twenty-three thousand, six hundred sixty-four".