72179533 has 4 divisors (see below), whose sum is σ = 72215388. Its totient is φ = 72143680.

The previous prime is 72179509. The next prime is 72179551. The reversal of 72179533 is 33597127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41951529 + 30228004 = 6477^2 + 5498^2 .

It is a cyclic number.

It is not a de Polignac number, because 72179533 - 2⁹ = 72179021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72179492 and 72179501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72179593) 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, 14716 + ... + 18997.

It is an arithmetic number, because the mean of its divisors is an integer number (18053847).

Almost surely, 2^72179533 is an apocalyptic number.

It is an amenable number.

72179533 is a deficient number, since it is larger than the sum of its proper divisors (35855).

72179533 is a wasteful number, since it uses less digits than its factorization.

72179533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35854.

The product of its digits is 39690, while the sum is 37.

The square root of 72179533 is about 8495.8538711539. The cubic root of 72179533 is about 416.3622587980.

The spelling of 72179533 in words is "seventy-two million, one hundred seventy-nine thousand, five hundred thirty-three".