28125378 has 48 divisors (see below), whose sum is σ = 65201760. Its totient is φ = 8731008.

The previous prime is 28125353. The next prime is 28125403. The reversal of 28125378 is 87352182.

28125378 is a `hidden beast` number, since 281 + 2 + 5 + 378 = 666.

It is an interprime number because it is at equal distance from previous prime (28125353) and next prime (28125403).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32313 + ... + 33171.

It is an arithmetic number, because the mean of its divisors is an integer number (1358370).

Almost surely, 2^28125378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28125378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32600880).

28125378 is an abundant number, since it is smaller than the sum of its proper divisors (37076382).

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

28125378 is a wasteful number, since it uses less digits than its factorization.

28125378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 988 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28125378 is about 5303.3364969611. The cubic root of 28125378 is about 304.1114621858. Note that the first 3 decimals are identical.

The spelling of 28125378 in words is "twenty-eight million, one hundred twenty-five thousand, three hundred seventy-eight".