72721727 has 8 divisors (see below), whose sum is σ = 78388464. Its totient is φ = 67065408.

The previous prime is 72721711. The next prime is 72721739. The reversal of 72721727 is 72712727.

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 72721727 - 2⁴ = 72721711 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 (72721757) 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, 17963 + ... + 21635.

It is an arithmetic number, because the mean of its divisors is an integer number (9798558).

Almost surely, 2^72721727 is an apocalyptic number.

72721727 is a deficient number, since it is larger than the sum of its proper divisors (5666737).

72721727 is a wasteful number, since it uses less digits than its factorization.

72721727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209.

The product of its digits is 19208, while the sum is 35.

The square root of 72721727 is about 8527.7035009433. The cubic root of 72721727 is about 417.4021944511.

The spelling of 72721727 in words is "seventy-two million, seven hundred twenty-one thousand, seven hundred twenty-seven".