72179561 has 8 divisors (see below), whose sum is σ = 73058304. Its totient is φ = 71305920.

The previous prime is 72179551. The next prime is 72179567. The reversal of 72179561 is 16597127.

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 72179561 - 2¹⁰ = 72178537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72179567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32321 + ... + 34481.

It is an arithmetic number, because the mean of its divisors is an integer number (9132288).

Almost surely, 2^72179561 is an apocalyptic number.

It is an amenable number.

72179561 is a deficient number, since it is larger than the sum of its proper divisors (878743).

72179561 is a wasteful number, since it uses less digits than its factorization.

72179561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551.

The product of its digits is 26460, while the sum is 38.

The square root of 72179561 is about 8495.8555190163. The cubic root of 72179561 is about 416.3623126366.

The spelling of 72179561 in words is "seventy-two million, one hundred seventy-nine thousand, five hundred sixty-one".