28001996 has 12 divisors (see below), whose sum is σ = 53458440. Its totient is φ = 12728160.

The previous prime is 28001993. The next prime is 28002019. The reversal of 28001996 is 69910082.

It is a super-2 number, since 2×28001996² = 1568223559968032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28001993) 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 3 ways as a sum of consecutive naturals, for example, 318161 + ... + 318248.

It is an arithmetic number, because the mean of its divisors is an integer number (4454870).

Almost surely, 2^28001996 is an apocalyptic number.

It is an amenable number.

28001996 is a deficient number, since it is larger than the sum of its proper divisors (25456444).

28001996 is a wasteful number, since it uses less digits than its factorization.

28001996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636424 (or 636422 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 28001996 is about 5291.6912230401. The cubic root of 28001996 is about 303.6661125299. Note that the first 3 decimals are identical.

The spelling of 28001996 in words is "twenty-eight million, one thousand, nine hundred ninety-six".