28378422 has 12 divisors (see below), whose sum is σ = 61486620. Its totient is φ = 9459468.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378422 is 22487382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378421) 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 5 ways as a sum of consecutive naturals, for example, 788272 + ... + 788307.

It is an arithmetic number, because the mean of its divisors is an integer number (5123885).

Almost surely, 2^28378422 is an apocalyptic number.

28378422 is an abundant number, since it is smaller than the sum of its proper divisors (33108198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28378422 is a wasteful number, since it uses less digits than its factorization.

28378422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576587 (or 1576584 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28378422 is about 5327.1401333173. The cubic root of 28378422 is about 305.0207707793.

The spelling of 28378422 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred twenty-two".