28406238 has 16 divisors (see below), whose sum is σ = 64928640. Its totient is φ = 8116056.

The previous prime is 28406233. The next prime is 28406239. The reversal of 28406238 is 83260482.

It is a junction number, because it is equal to n+sod(n) for n = 28406199 and 28406208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28406233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338128 + ... + 338211.

It is an arithmetic number, because the mean of its divisors is an integer number (4058040).

Almost surely, 2^28406238 is an apocalyptic number.

28406238 is an abundant number, since it is smaller than the sum of its proper divisors (36522402).

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

28406238 is a wasteful number, since it uses less digits than its factorization.

28406238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676351.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28406238 is about 5329.7502755758. The cubic root of 28406238 is about 305.1203967929.

The spelling of 28406238 in words is "twenty-eight million, four hundred six thousand, two hundred thirty-eight".