72288215 has 4 divisors (see below), whose sum is σ = 86745864. Its totient is φ = 57830568.

The previous prime is 72288211. The next prime is 72288221. The reversal of 72288215 is 51288227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51288227 = 1459 ⋅35153.

It is a cyclic number.

It is not a de Polignac number, because 72288215 - 2² = 72288211 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 (72288211) 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, 7228817 + ... + 7228826.

It is an arithmetic number, because the mean of its divisors is an integer number (21686466).

Almost surely, 2^72288215 is an apocalyptic number.

72288215 is a deficient number, since it is larger than the sum of its proper divisors (14457649).

72288215 is a wasteful number, since it uses less digits than its factorization.

72288215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14457648.

The product of its digits is 17920, while the sum is 35.

The square root of 72288215 is about 8502.2476440057. The cubic root of 72288215 is about 416.5711286734.

The spelling of 72288215 in words is "seventy-two million, two hundred eighty-eight thousand, two hundred fifteen".