72720533 has 8 divisors (see below), whose sum is σ = 73885728. Its totient is φ = 71562384.

The previous prime is 72720497. The next prime is 72720541. The reversal of 72720533 is 33502727.

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 72720533 - 2¹⁰ = 72719509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72720496 and 72720505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72720433) 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 7 ways as a sum of consecutive naturals, for example, 21410 + ... + 24572.

It is an arithmetic number, because the mean of its divisors is an integer number (9235716).

Almost surely, 2^72720533 is an apocalyptic number.

It is an amenable number.

72720533 is a deficient number, since it is larger than the sum of its proper divisors (1165195).

72720533 is a wasteful number, since it uses less digits than its factorization.

72720533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523.

The product of its (nonzero) digits is 8820, while the sum is 29.

The square root of 72720533 is about 8527.6334935315. The cubic root of 72720533 is about 417.3999100309.

The spelling of 72720533 in words is "seventy-two million, seven hundred twenty thousand, five hundred thirty-three".