28680378 has 16 divisors (see below), whose sum is σ = 57953280. Its totient is φ = 9461376.

The previous prime is 28680373. The next prime is 28680383. The reversal of 28680378 is 87308682.

It is an interprime number because it is at equal distance from previous prime (28680373) and next prime (28680383).

It is not an unprimeable number, because it can be changed into a prime (28680371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24058 + ... + 25221.

It is an arithmetic number, because the mean of its divisors is an integer number (3622080).

Almost surely, 2^28680378 is an apocalyptic number.

28680378 is an abundant number, since it is smaller than the sum of its proper divisors (29272902).

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

28680378 is a wasteful number, since it uses less digits than its factorization.

28680378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49381.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28680378 is about 5355.4064271538. The cubic root of 28680378 is about 306.0987976080.

The spelling of 28680378 in words is "twenty-eight million, six hundred eighty thousand, three hundred seventy-eight".