28145878 has 8 divisors (see below), whose sum is σ = 44440920. Its totient is φ = 13332240.

The previous prime is 28145849. The next prime is 28145879. The reversal of 28145878 is 87854182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145879) 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, 370303 + ... + 370378.

It is an arithmetic number, because the mean of its divisors is an integer number (5555115).

Almost surely, 2^28145878 is an apocalyptic number.

28145878 is a deficient number, since it is larger than the sum of its proper divisors (16295042).

28145878 is a wasteful number, since it uses less digits than its factorization.

28145878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740702.

The product of its digits is 143360, while the sum is 43.

The square root of 28145878 is about 5305.2688904522. The cubic root of 28145878 is about 304.1853310704.

The spelling of 28145878 in words is "twenty-eight million, one hundred forty-five thousand, eight hundred seventy-eight".