72161472 has 28 divisors (see below), whose sum is σ = 190927736. Its totient is φ = 24053760.

The previous prime is 72161431. The next prime is 72161477. The reversal of 72161472 is 27416127.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72161477) 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, 187729 + ... + 188112.

Almost surely, 2^72161472 is an apocalyptic number.

It is an amenable number.

72161472 is an abundant number, since it is smaller than the sum of its proper divisors (118766264).

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

72161472 is a wasteful number, since it uses less digits than its factorization.

72161472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375856 (or 375846 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 72161472 is about 8494.7908744124. The cubic root of 72161472 is about 416.3275280567.

Adding to 72161472 its reverse (27416127), we get a palindrome (99577599).

The spelling of 72161472 in words is "seventy-two million, one hundred sixty-one thousand, four hundred seventy-two".