72647305 has 4 divisors (see below), whose sum is σ = 87176772. Its totient is φ = 58117840.

The previous prime is 72647297. The next prime is 72647359. The reversal of 72647305 is 50374627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50374627 = 953 ⋅52859.

It can be written as a sum of positive squares in 2 ways, for example, as 25532809 + 47114496 = 5053^2 + 6864^2 .

It is not a de Polignac number, because 72647305 - 2³ = 72647297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7264726 + ... + 7264735.

It is an arithmetic number, because the mean of its divisors is an integer number (21794193).

Almost surely, 2^72647305 is an apocalyptic number.

It is an amenable number.

72647305 is a deficient number, since it is larger than the sum of its proper divisors (14529467).

72647305 is a wasteful number, since it uses less digits than its factorization.

72647305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14529466.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 72647305 is about 8523.3388410880. The cubic root of 72647305 is about 417.2597587575.

The spelling of 72647305 in words is "seventy-two million, six hundred forty-seven thousand, three hundred five".