72216140 has 12 divisors (see below), whose sum is σ = 151653936. Its totient is φ = 28886448.

The previous prime is 72216139. The next prime is 72216149. The reversal of 72216140 is 4161227.

It is not an unprimeable number, because it can be changed into a prime (72216149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805384 + ... + 1805423.

It is an arithmetic number, because the mean of its divisors is an integer number (12637828).

Almost surely, 2^72216140 is an apocalyptic number.

It is an amenable number.

72216140 is an abundant number, since it is smaller than the sum of its proper divisors (79437796).

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

72216140 is a wasteful number, since it uses less digits than its factorization.

72216140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610816 (or 3610814 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 72216140 is about 8498.0080018790. The cubic root of 72216140 is about 416.4326351526.

Adding to 72216140 its reverse (4161227), we get a palindrome (76377367).

The spelling of 72216140 in words is "seventy-two million, two hundred sixteen thousand, one hundred forty".