72247209 has 8 divisors (see below), whose sum is σ = 100517952. Its totient is φ = 46070640.

The previous prime is 72247183. The next prime is 72247247. The reversal of 72247209 is 90274227.

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

It is not a de Polignac number, because 72247209 - 2⁸ = 72246953 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72247209.

It is not an unprimeable number, because it can be changed into a prime (72245209) 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, 523462 + ... + 523599.

It is an arithmetic number, because the mean of its divisors is an integer number (12564744).

Almost surely, 2^72247209 is an apocalyptic number.

It is an amenable number.

72247209 is a deficient number, since it is larger than the sum of its proper divisors (28270743).

72247209 is a wasteful number, since it uses less digits than its factorization.

72247209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047087.

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

The square root of 72247209 is about 8499.8358219439. The cubic root of 72247209 is about 416.4923461376.

The spelling of 72247209 in words is "seventy-two million, two hundred forty-seven thousand, two hundred nine".