28149378 has 48 divisors (see below), whose sum is σ = 60782400. Its totient is φ = 8673984.

The previous prime is 28149371. The next prime is 28149383. The reversal of 28149378 is 87394182.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28149371) by changing a digit.

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, 188848 + ... + 188996.

It is an arithmetic number, because the mean of its divisors is an integer number (1266300).

Almost surely, 2^28149378 is an apocalyptic number.

28149378 is an abundant number, since it is smaller than the sum of its proper divisors (32633022).

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

28149378 is a wasteful number, since it uses less digits than its factorization.

28149378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 214 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 28149378 is about 5305.5987409528. The cubic root of 28149378 is about 304.1979392462.

The spelling of 28149378 in words is "twenty-eight million, one hundred forty-nine thousand, three hundred seventy-eight".