28391378 has 8 divisors (see below), whose sum is σ = 42631920. Its totient is φ = 14180740.

The previous prime is 28391371. The next prime is 28391383. The reversal of 28391378 is 87319382.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28391371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4928 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (5328990).

Almost surely, 2^28391378 is an apocalyptic number.

28391378 is a deficient number, since it is larger than the sum of its proper divisors (14240542).

28391378 is a wasteful number, since it uses less digits than its factorization.

28391378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14952.

The product of its digits is 72576, while the sum is 41.

The square root of 28391378 is about 5328.3560316480. The cubic root of 28391378 is about 305.0671821908.

The spelling of 28391378 in words is "twenty-eight million, three hundred ninety-one thousand, three hundred seventy-eight".