28921148 has 24 divisors (see below), whose sum is σ = 54132624. Its totient is φ = 13472000.

The previous prime is 28921147. The next prime is 28921159. The reversal of 28921148 is 84112982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4763 + ... + 8973.

It is an arithmetic number, because the mean of its divisors is an integer number (2255526).

Almost surely, 2^28921148 is an apocalyptic number.

It is an amenable number.

28921148 is a deficient number, since it is larger than the sum of its proper divisors (25211476).

28921148 is a wasteful number, since it uses less digits than its factorization.

28921148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4333 (or 4331 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 28921148 is about 5377.8385992888. The cubic root of 28921148 is about 306.9529719615.

The spelling of 28921148 in words is "twenty-eight million, nine hundred twenty-one thousand, one hundred forty-eight".