72117515 has 8 divisors (see below), whose sum is σ = 86589600. Its totient is φ = 57661632.

The previous prime is 72117511. The next prime is 72117569. The reversal of 72117515 is 51571127.

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

It is a cyclic number.

It is not a de Polignac number, because 72117515 - 2² = 72117511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72117511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10511 + ... + 15959.

It is an arithmetic number, because the mean of its divisors is an integer number (10823700).

Almost surely, 2^72117515 is an apocalyptic number.

72117515 is a deficient number, since it is larger than the sum of its proper divisors (14472085).

72117515 is a wasteful number, since it uses less digits than its factorization.

72117515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8101.

The product of its digits is 2450, while the sum is 29.

The square root of 72117515 is about 8492.2031888080. The cubic root of 72117515 is about 416.2429758905.

The spelling of 72117515 in words is "seventy-two million, one hundred seventeen thousand, five hundred fifteen".