28617321 has 16 divisors (see below), whose sum is σ = 38848320. Its totient is φ = 18735360.

The previous prime is 28617311. The next prime is 28617349. The reversal of 28617321 is 12371682.

It is not a de Polignac number, because 28617321 - 2¹³ = 28609129 is a prime.

It is a super-2 number, since 2×28617321² = 1637902122434082, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28617311) 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 15 ways as a sum of consecutive naturals, for example, 69765 + ... + 70173.

It is an arithmetic number, because the mean of its divisors is an integer number (2428020).

Almost surely, 2^28617321 is an apocalyptic number.

It is an amenable number.

28617321 is a deficient number, since it is larger than the sum of its proper divisors (10230999).

28617321 is a wasteful number, since it uses less digits than its factorization.

28617321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its digits is 4032, while the sum is 30.

The square root of 28617321 is about 5349.5159594117. The cubic root of 28617321 is about 305.8743022543.

The spelling of 28617321 in words is "twenty-eight million, six hundred seventeen thousand, three hundred twenty-one".