28125978 has 8 divisors (see below), whose sum is σ = 56251968. Its totient is φ = 9375324.

The previous prime is 28125967. The next prime is 28125989. The reversal of 28125978 is 87952182.

It is an interprime number because it is at equal distance from previous prime (28125967) and next prime (28125989).

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

28125978 is an admirable number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2343826 + ... + 2343837.

It is an arithmetic number, because the mean of its divisors is an integer number (7031496).

Almost surely, 2^28125978 is an apocalyptic number.

28125978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28125978 is a wasteful number, since it uses less digits than its factorization.

28125978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687668.

The product of its digits is 80640, while the sum is 42.

The square root of 28125978 is about 5303.3930648218. The cubic root of 28125978 is about 304.1136247118.

The spelling of 28125978 in words is "twenty-eight million, one hundred twenty-five thousand, nine hundred seventy-eight".