72160621 has 8 divisors (see below), whose sum is σ = 78986264. Its totient is φ = 65517120.

The previous prime is 72160607. The next prime is 72160633. The reversal of 72160621 is 12606127.

It can be written as a sum of positive squares in 4 ways, for example, as 11492100 + 60668521 = 3390^2 + 7789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72160621 - 2¹¹ = 72158573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72160601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44706 + ... + 46291.

It is an arithmetic number, because the mean of its divisors is an integer number (9873283).

Almost surely, 2^72160621 is an apocalyptic number.

It is an amenable number.

72160621 is a deficient number, since it is larger than the sum of its proper divisors (6825643).

72160621 is a wasteful number, since it uses less digits than its factorization.

72160621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91071.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 72160621 is about 8494.7407847444. The cubic root of 72160621 is about 416.3258914672.

Adding to 72160621 its reverse (12606127), we get a palindrome (84766748).

The spelling of 72160621 in words is "seventy-two million, one hundred sixty thousand, six hundred twenty-one".