72304287 has 16 divisors (see below), whose sum is σ = 106157952. Its totient is φ = 43409120.

The previous prime is 72304273. The next prime is 72304301. The reversal of 72304287 is 78240327.

It is an interprime number because it is at equal distance from previous prime (72304273) and next prime (72304301).

It is a cyclic number.

It is not a de Polignac number, because 72304287 - 2¹⁰ = 72303263 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72304217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6708 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (6634872).

Almost surely, 2^72304287 is an apocalyptic number.

72304287 is a deficient number, since it is larger than the sum of its proper divisors (33853665).

72304287 is a wasteful number, since it uses less digits than its factorization.

72304287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20598.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 72304287 is about 8503.1927533133. The cubic root of 72304287 is about 416.6019987817.

The spelling of 72304287 in words is "seventy-two million, three hundred four thousand, two hundred eighty-seven".