28065550 has 24 divisors (see below), whose sum is σ = 52347096. Its totient is φ = 11195040.

The previous prime is 28065539. The next prime is 28065581. The reversal of 28065550 is 5556082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27652 + ... + 28648.

It is an arithmetic number, because the mean of its divisors is an integer number (2181129).

Almost surely, 2^28065550 is an apocalyptic number.

28065550 is a deficient number, since it is larger than the sum of its proper divisors (24281546).

28065550 is a wasteful number, since it uses less digits than its factorization.

28065550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 28065550 is about 5297.6928940813. The cubic root of 28065550 is about 303.8956749018.

The spelling of 28065550 in words is "twenty-eight million, sixty-five thousand, five hundred fifty".