28921151 has 16 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 24184608.

The previous prime is 28921147. The next prime is 28921159. The reversal of 28921151 is 15112982.

It is not a de Polignac number, because 28921151 - 2² = 28921147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98561 + ... + 98853.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^28921151 is an apocalyptic number.

28921151 is a deficient number, since it is larger than the sum of its proper divisors (4947649).

28921151 is a wasteful number, since it uses less digits than its factorization.

28921151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598.

The product of its digits is 1440, while the sum is 29.

The square root of 28921151 is about 5377.8388782112. The cubic root of 28921151 is about 306.9529825749.

The spelling of 28921151 in words is "twenty-eight million, nine hundred twenty-one thousand, one hundred fifty-one".