28600921 has 4 divisors (see below), whose sum is σ = 28772352. Its totient is φ = 28429492.

The previous prime is 28600883. The next prime is 28600967. The reversal of 28600921 is 12900682.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 12900682 = 2 ⋅6450341.

It is a cyclic number.

It is not a de Polignac number, because 28600921 - 2¹¹ = 28598873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28600921.

It is not an unprimeable number, because it can be changed into a prime (28600981) 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 3 ways as a sum of consecutive naturals, for example, 85465 + ... + 85798.

It is an arithmetic number, because the mean of its divisors is an integer number (7193088).

Almost surely, 2^28600921 is an apocalyptic number.

It is an amenable number.

28600921 is a deficient number, since it is larger than the sum of its proper divisors (171431).

28600921 is a wasteful number, since it uses less digits than its factorization.

28600921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171430.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28600921 is about 5347.9828907729. The cubic root of 28600921 is about 305.8158609917.

The spelling of 28600921 in words is "twenty-eight million, six hundred thousand, nine hundred twenty-one".