72232240 has 20 divisors (see below), whose sum is σ = 167940144. Its totient is φ = 28892864.

The previous prime is 72232187. The next prime is 72232247. The reversal of 72232240 is 4223227.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (72232247) 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, 451372 + ... + 451531.

Almost surely, 2^72232240 is an apocalyptic number.

It is an amenable number.

72232240 is an abundant number, since it is smaller than the sum of its proper divisors (95707904).

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

72232240 is a wasteful number, since it uses less digits than its factorization.

72232240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902916 (or 902910 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 72232240 is about 8498.9552299091. The cubic root of 72232240 is about 416.4635796074.

Adding to 72232240 its reverse (4223227), we get a palindrome (76455467).

The spelling of 72232240 in words is "seventy-two million, two hundred thirty-two thousand, two hundred forty".