72223649 has 4 divisors (see below), whose sum is σ = 72526080. Its totient is φ = 71921220.

The previous prime is 72223639. The next prime is 72223651. The reversal of 72223649 is 94632227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72223649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72223639) 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 in 3 ways as a sum of consecutive naturals, for example, 150857 + ... + 151334.

It is an arithmetic number, because the mean of its divisors is an integer number (18131520).

Almost surely, 2^72223649 is an apocalyptic number.

It is an amenable number.

72223649 is a deficient number, since it is larger than the sum of its proper divisors (302431).

72223649 is a wasteful number, since it uses less digits than its factorization.

72223649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302430.

The product of its digits is 36288, while the sum is 35.

The square root of 72223649 is about 8498.4497998164. The cubic root of 72223649 is about 416.4470681417.

The spelling of 72223649 in words is "seventy-two million, two hundred twenty-three thousand, six hundred forty-nine".