28157878 has 8 divisors (see below), whose sum is σ = 48270672. Its totient is φ = 12067656.

The previous prime is 28157863. The next prime is 28157897. The reversal of 28157878 is 87875182.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005625 + ... + 1005652.

It is an arithmetic number, because the mean of its divisors is an integer number (6033834).

Almost surely, 2^28157878 is an apocalyptic number.

28157878 is a deficient number, since it is larger than the sum of its proper divisors (20112794).

28157878 is a wasteful number, since it uses less digits than its factorization.

28157878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011286.

The product of its digits is 250880, while the sum is 46.

The square root of 28157878 is about 5306.3997210915. The cubic root of 28157878 is about 304.2285547512.

The spelling of 28157878 in words is "twenty-eight million, one hundred fifty-seven thousand, eight hundred seventy-eight".