28420286 has 8 divisors (see below), whose sum is σ = 42683760. Its totient is φ = 14192368.

The previous prime is 28420283. The next prime is 28420303. The reversal of 28420286 is 68202482.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28420283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6791 + ... + 10146.

It is an arithmetic number, because the mean of its divisors is an integer number (5335470).

Almost surely, 2^28420286 is an apocalyptic number.

28420286 is a deficient number, since it is larger than the sum of its proper divisors (14263474).

28420286 is a wasteful number, since it uses less digits than its factorization.

28420286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17778.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28420286 is about 5331.0679980657. The cubic root of 28420286 is about 305.1706865091.

The spelling of 28420286 in words is "twenty-eight million, four hundred twenty thousand, two hundred eighty-six".