28420436 has 24 divisors (see below), whose sum is σ = 54427296. Its totient is φ = 12877920.

The previous prime is 28420429. The next prime is 28420451. The reversal of 28420436 is 63402482.

It is a junction number, because it is equal to n+sod(n) for n = 28420399 and 28420408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16655 + ... + 18281.

It is an arithmetic number, because the mean of its divisors is an integer number (2267804).

Almost surely, 2^28420436 is an apocalyptic number.

It is an amenable number.

28420436 is a deficient number, since it is larger than the sum of its proper divisors (26006860).

28420436 is a wasteful number, since it uses less digits than its factorization.

28420436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 28420436 is about 5331.0820665227. The cubic root of 28420436 is about 305.1712233970.

The spelling of 28420436 in words is "twenty-eight million, four hundred twenty thousand, four hundred thirty-six".