72009415 has 4 divisors (see below), whose sum is σ = 86411304. Its totient is φ = 57607528.

The previous prime is 72009361. The next prime is 72009419. The reversal of 72009415 is 51490027.

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: 51490027 = 2713 ⋅18979.

It is a cyclic number.

It is not a de Polignac number, because 72009415 - 2⁹ = 72008903 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 (72009419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7200937 + ... + 7200946.

It is an arithmetic number, because the mean of its divisors is an integer number (21602826).

Almost surely, 2^72009415 is an apocalyptic number.

72009415 is a deficient number, since it is larger than the sum of its proper divisors (14401889).

72009415 is a wasteful number, since it uses less digits than its factorization.

72009415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14401888.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 72009415 is about 8485.8361402987. The cubic root of 72009415 is about 416.0348971434.

The spelling of 72009415 in words is "seventy-two million, nine thousand, four hundred fifteen".