72628217 has 4 divisors (see below), whose sum is σ = 72645456. Its totient is φ = 72610980.

The previous prime is 72628189. The next prime is 72628223. The reversal of 72628217 is 71282627.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72628217 - 2¹⁰ = 72627193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72628417) 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, 2378 + ... + 12284.

It is an arithmetic number, because the mean of its divisors is an integer number (18161364).

Almost surely, 2^72628217 is an apocalyptic number.

It is an amenable number.

72628217 is a deficient number, since it is larger than the sum of its proper divisors (17239).

72628217 is an equidigital number, since it uses as much as digits as its factorization.

72628217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17238.

The product of its digits is 18816, while the sum is 35.

The square root of 72628217 is about 8522.2190185421. The cubic root of 72628217 is about 417.2232107078.

The spelling of 72628217 in words is "seventy-two million, six hundred twenty-eight thousand, two hundred seventeen".