72132481 has 4 divisors (see below), whose sum is σ = 72447700. Its totient is φ = 71817264.

The previous prime is 72132469. The next prime is 72132497. The reversal of 72132481 is 18423127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18423127 = 3259 ⋅5653.

It can be written as a sum of positive squares in 2 ways, for example, as 35892081 + 36240400 = 5991^2 + 6020^2 .

It is a cyclic number.

It is not a de Polignac number, because 72132481 - 2⁵ = 72132449 is a prime.

It is a super-2 number, since 2×72132481² = 10406189630430722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72132461) 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, 157266 + ... + 157723.

It is an arithmetic number, because the mean of its divisors is an integer number (18111925).

Almost surely, 2^72132481 is an apocalyptic number.

It is an amenable number.

72132481 is a deficient number, since it is larger than the sum of its proper divisors (315219).

72132481 is a wasteful number, since it uses less digits than its factorization.

72132481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315218.

The product of its digits is 2688, while the sum is 28.

The square root of 72132481 is about 8493.0843043031. The cubic root of 72132481 is about 416.2717671465.

The spelling of 72132481 in words is "seventy-two million, one hundred thirty-two thousand, four hundred eighty-one".