72421017 has 8 divisors (see below), whose sum is σ = 97447680. Its totient is φ = 47837520.

The previous prime is 72421009. The next prime is 72421067. The reversal of 72421017 is 71012427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72421017 - 2³ = 72421009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72421067) 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, 110409 + ... + 111062.

It is an arithmetic number, because the mean of its divisors is an integer number (12180960).

Almost surely, 2^72421017 is an apocalyptic number.

It is an amenable number.

72421017 is a deficient number, since it is larger than the sum of its proper divisors (25026663).

72421017 is a wasteful number, since it uses less digits than its factorization.

72421017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221583.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 72421017 is about 8510.0538776203. The cubic root of 72421017 is about 416.8260694278.

The spelling of 72421017 in words is "seventy-two million, four hundred twenty-one thousand, seventeen".