28378923 has 8 divisors (see below), whose sum is σ = 38127936. Its totient is φ = 18774600.

The previous prime is 28378901. The next prime is 28378937. The reversal of 28378923 is 32987382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28378923 - 2⁹ = 28378411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28378943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35713 + ... + 36498.

It is an arithmetic number, because the mean of its divisors is an integer number (4765992).

Almost surely, 2^28378923 is an apocalyptic number.

28378923 is a deficient number, since it is larger than the sum of its proper divisors (9749013).

28378923 is a wasteful number, since it uses less digits than its factorization.

28378923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72345.

The product of its digits is 145152, while the sum is 42.

The square root of 28378923 is about 5327.1871564645. The cubic root of 28378923 is about 305.0225657406.

The spelling of 28378923 in words is "twenty-eight million, three hundred seventy-eight thousand, nine hundred twenty-three".