28641217 has 8 divisors (see below), whose sum is σ = 31289472. Its totient is φ = 26000400.

The previous prime is 28641211. The next prime is 28641229. The reversal of 28641217 is 71214682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28641217 is a prime.

It is a super-2 number, since 2×28641217² = 1640638622482178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28641211) 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, 8968 + ... + 11734.

It is an arithmetic number, because the mean of its divisors is an integer number (3911184).

Almost surely, 2^28641217 is an apocalyptic number.

It is an amenable number.

28641217 is a deficient number, since it is larger than the sum of its proper divisors (2648255).

28641217 is a wasteful number, since it uses less digits than its factorization.

28641217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719.

The product of its digits is 5376, while the sum is 31.

The square root of 28641217 is about 5351.7489664595. The cubic root of 28641217 is about 305.9594154956.

Adding to 28641217 its reverse (71214682), we get a palindrome (99855899).

The spelling of 28641217 in words is "twenty-eight million, six hundred forty-one thousand, two hundred seventeen".