28378340 has 12 divisors (see below), whose sum is σ = 59594556. Its totient is φ = 11351328.

The previous prime is 28378331. The next prime is 28378393. The reversal of 28378340 is 4387382.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 7929856 = 4522^2 + 2816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28378340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709439 + ... + 709478.

It is an arithmetic number, because the mean of its divisors is an integer number (4966213).

Almost surely, 2^28378340 is an apocalyptic number.

28378340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28378340 is an abundant number, since it is smaller than the sum of its proper divisors (31216216).

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

28378340 is a wasteful number, since it uses less digits than its factorization.

28378340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418926 (or 1418924 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 28378340 is about 5327.1324368745. The cubic root of 28378340 is about 305.0204769912.

The spelling of 28378340 in words is "twenty-eight million, three hundred seventy-eight thousand, three hundred forty".