72209549 has 8 divisors (see below), whose sum is σ = 72940728. Its totient is φ = 71481600.

The previous prime is 72209539. The next prime is 72209551. The reversal of 72209549 is 94590227.

It can be written as a sum of positive squares in 4 ways, for example, as 38068900 + 34140649 = 6170^2 + 5843^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72209549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72209539) 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 7 ways as a sum of consecutive naturals, for example, 81899 + ... + 82775.

It is an arithmetic number, because the mean of its divisors is an integer number (9117591).

Almost surely, 2^72209549 is an apocalyptic number.

It is an amenable number.

72209549 is a deficient number, since it is larger than the sum of its proper divisors (731179).

72209549 is a wasteful number, since it uses less digits than its factorization.

72209549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 72209549 is about 8497.6201962667. The cubic root of 72209549 is about 416.4199658195.

The spelling of 72209549 in words is "seventy-two million, two hundred nine thousand, five hundred forty-nine".