72224709 has 4 divisors (see below), whose sum is σ = 96299616. Its totient is φ = 48149804.

The previous prime is 72224707. The next prime is 72224717. The reversal of 72224709 is 90742227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90742227 = 3 ⋅30247409.

It is a cyclic number.

It is not a de Polignac number, because 72224709 - 2¹ = 72224707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72224709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72224701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12037449 + ... + 12037454.

It is an arithmetic number, because the mean of its divisors is an integer number (24074904).

Almost surely, 2^72224709 is an apocalyptic number.

It is an amenable number.

72224709 is a deficient number, since it is larger than the sum of its proper divisors (24074907).

72224709 is a wasteful number, since it uses less digits than its factorization.

72224709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24074906.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 72224709 is about 8498.5121639026. The cubic root of 72224709 is about 416.4491054787.

The spelling of 72224709 in words is "seventy-two million, two hundred twenty-four thousand, seven hundred nine".