72015317 has 4 divisors (see below), whose sum is σ = 78562176. Its totient is φ = 65468460.

The previous prime is 72015313. The next prime is 72015367. The reversal of 72015317 is 71351027.

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.

It is a cyclic number.

It is not a de Polignac number, because 72015317 - 2² = 72015313 is a prime.

It is a super-2 number, since 2×72015317² = 10372411765220978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72015313) 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, 3273413 + ... + 3273434.

It is an arithmetic number, because the mean of its divisors is an integer number (19640544).

Almost surely, 2^72015317 is an apocalyptic number.

It is an amenable number.

72015317 is a deficient number, since it is larger than the sum of its proper divisors (6546859).

72015317 is a wasteful number, since it uses less digits than its factorization.

72015317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6546858.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 72015317 is about 8486.1838891224. The cubic root of 72015317 is about 416.0462631149.

The spelling of 72015317 in words is "seventy-two million, fifteen thousand, three hundred seventeen".