28005972 has 24 divisors (see below), whose sum is σ = 65454816. Its totient is φ = 9319968.

The previous prime is 28005941. The next prime is 28005979. The reversal of 28005972 is 27950082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005979) 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 7 ways as a sum of consecutive naturals, for example, 7543 + ... + 10625.

It is an arithmetic number, because the mean of its divisors is an integer number (2727284).

Almost surely, 2^28005972 is an apocalyptic number.

It is an amenable number.

28005972 is an abundant number, since it is smaller than the sum of its proper divisors (37448844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28005972 is a wasteful number, since it uses less digits than its factorization.

28005972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847 (or 3845 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28005972 is about 5292.0668930013. The cubic root of 28005972 is about 303.6804843545.

The spelling of 28005972 in words is "twenty-eight million, five thousand, nine hundred seventy-two".