28938340 has 12 divisors (see below), whose sum is σ = 60770556. Its totient is φ = 11575328.

The previous prime is 28938313. The next prime is 28938383. The reversal of 28938340 is 4383982.

It can be written as a sum of positive squares in 2 ways, for example, as 6584356 + 22353984 = 2566^2 + 4728^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28938340.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 723439 + ... + 723478.

It is an arithmetic number, because the mean of its divisors is an integer number (5064213).

Almost surely, 2^28938340 is an apocalyptic number.

28938340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28938340 is an abundant number, since it is smaller than the sum of its proper divisors (31832216).

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

28938340 is a wasteful number, since it uses less digits than its factorization.

28938340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446926 (or 1446924 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 28938340 is about 5379.4367734922. The cubic root of 28938340 is about 307.0137820209.

The spelling of 28938340 in words is "twenty-eight million, nine hundred thirty-eight thousand, three hundred forty".