72419517 has 6 divisors (see below), whose sum is σ = 104605982. Its totient is φ = 48279672.

The previous prime is 72419509. The next prime is 72419519. The reversal of 72419517 is 71591427.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 71723961 + 695556 = 8469^2 + 834^2 .

It is not a de Polignac number, because 72419517 - 2³ = 72419509 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 (72419519) 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 5 ways as a sum of consecutive naturals, for example, 4023298 + ... + 4023315.

Almost surely, 2^72419517 is an apocalyptic number.

It is an amenable number.

72419517 is a deficient number, since it is larger than the sum of its proper divisors (32186465).

72419517 is a wasteful number, since it uses less digits than its factorization.

72419517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8046619 (or 8046616 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 72419517 is about 8509.9657461120. The cubic root of 72419517 is about 416.8231916103.

The spelling of 72419517 in words is "seventy-two million, four hundred nineteen thousand, five hundred seventeen".