28590121 has 4 divisors (see below), whose sum is σ = 32674432. Its totient is φ = 24505812.

The previous prime is 28590103. The next prime is 28590139. The reversal of 28590121 is 12109582.

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.

It is an interprime number because it is at equal distance from previous prime (28590103) and next prime (28590139).

It is a cyclic number.

It is not a de Polignac number, because 28590121 - 2⁷ = 28589993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28590121.

It is not an unprimeable number, because it can be changed into a prime (28590101) 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, 2042145 + ... + 2042158.

It is an arithmetic number, because the mean of its divisors is an integer number (8168608).

Almost surely, 2^28590121 is an apocalyptic number.

It is an amenable number.

28590121 is a deficient number, since it is larger than the sum of its proper divisors (4084311).

28590121 is an equidigital number, since it uses as much as digits as its factorization.

28590121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084310.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 28590121 is about 5346.9730689428. The cubic root of 28590121 is about 305.7773630810. Note that the first 3 decimals are identical.

The spelling of 28590121 in words is "twenty-eight million, five hundred ninety thousand, one hundred twenty-one".