28091996 has 6 divisors (see below), whose sum is σ = 49161000. Its totient is φ = 14045996.

The previous prime is 28091977. The next prime is 28092023. The reversal of 28091996 is 69919082.

It is a congruent number.

It is an unprimeable number.

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, 3511496 + ... + 3511503.

It is an arithmetic number, because the mean of its divisors is an integer number (8193500).

Almost surely, 2^28091996 is an apocalyptic number.

It is an amenable number.

28091996 is a deficient number, since it is larger than the sum of its proper divisors (21069004).

28091996 is a wasteful number, since it uses less digits than its factorization.

28091996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023003 (or 7023001 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 28091996 is about 5300.1882985419. The cubic root of 28091996 is about 303.9910979619.

The spelling of 28091996 in words is "twenty-eight million, ninety-one thousand, nine hundred ninety-six".