28628121 has 16 divisors (see below), whose sum is σ = 39368000. Its totient is φ = 18491328.

The previous prime is 28628113. The next prime is 28628143. The reversal of 28628121 is 12182682.

It is not a de Polignac number, because 28628121 - 2³ = 28628113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28628021) 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, 38370 + ... + 39108.

It is an arithmetic number, because the mean of its divisors is an integer number (2460500).

Almost surely, 2^28628121 is an apocalyptic number.

It is an amenable number.

28628121 is a deficient number, since it is larger than the sum of its proper divisors (10739879).

28628121 is a wasteful number, since it uses less digits than its factorization.

28628121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128.

The product of its digits is 3072, while the sum is 30.

The square root of 28628121 is about 5350.5253013139. The cubic root of 28628121 is about 305.9127757716.

The spelling of 28628121 in words is "twenty-eight million, six hundred twenty-eight thousand, one hundred twenty-one".