72209544 has 32 divisors (see below), whose sum is σ = 196935840. Its totient is φ = 21881600.

The previous prime is 72209539. The next prime is 72209551. The reversal of 72209544 is 44590227.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 136497 + ... + 137024.

It is an arithmetic number, because the mean of its divisors is an integer number (6154245).

Almost surely, 2^72209544 is an apocalyptic number.

It is an amenable number.

72209544 is an abundant number, since it is smaller than the sum of its proper divisors (124726296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72209544 is a wasteful number, since it uses less digits than its factorization.

72209544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273541 (or 273537 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 72209544 is about 8497.6199020667. The cubic root of 72209544 is about 416.4199562081.

The spelling of 72209544 in words is "seventy-two million, two hundred nine thousand, five hundred forty-four".