28378540 has 48 divisors (see below), whose sum is σ = 61236000. Its totient is φ = 11044352.

The previous prime is 28378523. The next prime is 28378541. The reversal of 28378540 is 4587382.

It is a self number, because there is not a number n which added to its sum of digits gives 28378540.

It is not an unprimeable number, because it can be changed into a prime (28378541) 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, 190386 + ... + 190534.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^28378540 is an apocalyptic number.

28378540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28378540 is an abundant number, since it is smaller than the sum of its proper divisors (32857460).

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

28378540 is a wasteful number, since it uses less digits than its factorization.

28378540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28378540 is about 5327.1512086668. The cubic root of 28378540 is about 305.0211935465.

The spelling of 28378540 in words is "twenty-eight million, three hundred seventy-eight thousand, five hundred forty".