187838028 has 144 divisors (see below), whose sum is σ = 592766720. Its totient is φ = 50808384.

The previous prime is 187838023. The next prime is 187838041. The reversal of 187838028 is 820838781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187838023) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 128550 + ... + 130002.

Almost surely, 2^187838028 is an apocalyptic number.

187838028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 187838028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296383360).

187838028 is an abundant number, since it is smaller than the sum of its proper divisors (404928692).

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

187838028 is a wasteful number, since it uses less digits than its factorization.

187838028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 187838028 is about 13705.4014169597. The cubic root of 187838028 is about 572.7008663150.

The spelling of 187838028 in words is "one hundred eighty-seven million, eight hundred thirty-eight thousand, twenty-eight".