72720489 has 8 divisors (see below), whose sum is σ = 97178400. Its totient is φ = 48371456.

The previous prime is 72720437. The next prime is 72720497. The reversal of 72720489 is 98402727.

72720489 = 157² + 158² + ... + 605².

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 72720489 - 2¹¹ = 72718441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72720409) 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, 25647 + ... + 28340.

It is an arithmetic number, because the mean of its divisors is an integer number (12147300).

Almost surely, 2^72720489 is an apocalyptic number.

It is an amenable number.

72720489 is a deficient number, since it is larger than the sum of its proper divisors (24457911).

72720489 is a wasteful number, since it uses less digits than its factorization.

72720489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54439.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 72720489 is about 8527.6309136829. The cubic root of 72720489 is about 417.3998258474.

The spelling of 72720489 in words is "seventy-two million, seven hundred twenty thousand, four hundred eighty-nine".