28121452 has 6 divisors (see below), whose sum is σ = 49212548. Its totient is φ = 14060724.

The previous prime is 28121413. The next prime is 28121453. The reversal of 28121452 is 25412182.

It is not an unprimeable number, because it can be changed into a prime (28121453) 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 as a sum of consecutive naturals, namely, 3515178 + ... + 3515185.

Almost surely, 2^28121452 is an apocalyptic number.

It is an amenable number.

28121452 is a deficient number, since it is larger than the sum of its proper divisors (21091096).

28121452 is a wasteful number, since it uses less digits than its factorization.

28121452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7030367 (or 7030365 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 28121452 is about 5302.9663397008. The cubic root of 28121452 is about 304.0973112986.

The spelling of 28121452 in words is "twenty-eight million, one hundred twenty-one thousand, four hundred fifty-two".