28420418 has 32 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 12695040.

The previous prime is 28420411. The next prime is 28420429. The reversal of 28420418 is 81402482.

It is not an unprimeable number, because it can be changed into a prime (28420411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148703 + ... + 148893.

It is an arithmetic number, because the mean of its divisors is an integer number (1481760).

Almost surely, 2^28420418 is an apocalyptic number.

28420418 is a deficient number, since it is larger than the sum of its proper divisors (18995902).

28420418 is a wasteful number, since it uses less digits than its factorization.

28420418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28420418 is about 5331.0803783098. The cubic root of 28420418 is about 305.1711589705.

It can be divided in two parts, 284 and 20418, that added together give a palindrome (20702).

The spelling of 28420418 in words is "twenty-eight million, four hundred twenty thousand, four hundred eighteen".