28343878 has 4 divisors (see below), whose sum is σ = 42515820. Its totient is φ = 14171938.

The previous prime is 28343873. The next prime is 28343891. The reversal of 28343878 is 87834382.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343873) 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 as a sum of consecutive naturals, namely, 7085968 + ... + 7085971.

It is an arithmetic number, because the mean of its divisors is an integer number (10628955).

Almost surely, 2^28343878 is an apocalyptic number.

28343878 is a deficient number, since it is larger than the sum of its proper divisors (14171942).

28343878 is a wasteful number, since it uses less digits than its factorization.

28343878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14171941.

The product of its digits is 258048, while the sum is 43.

The square root of 28343878 is about 5323.8968810449. The cubic root of 28343878 is about 304.8969570394.

The spelling of 28343878 in words is "twenty-eight million, three hundred forty-three thousand, eight hundred seventy-eight".