72317649 has 4 divisors (see below), whose sum is σ = 96423536. Its totient is φ = 48211764.

The previous prime is 72317603. The next prime is 72317659. The reversal of 72317649 is 94671327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94671327 = 3 ⋅31557109.

It is not a de Polignac number, because 72317649 - 2⁷ = 72317521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72317659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12052939 + ... + 12052944.

It is an arithmetic number, because the mean of its divisors is an integer number (24105884).

Almost surely, 2^72317649 is an apocalyptic number.

It is an amenable number.

72317649 is a deficient number, since it is larger than the sum of its proper divisors (24105887).

72317649 is a wasteful number, since it uses less digits than its factorization.

72317649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24105886.

The product of its digits is 63504, while the sum is 39.

The square root of 72317649 is about 8503.9784218917. The cubic root of 72317649 is about 416.6276602063.

The spelling of 72317649 in words is "seventy-two million, three hundred seventeen thousand, six hundred forty-nine".