187428 has 12 divisors (see below), whose sum is σ = 437360. Its totient is φ = 62472.

The previous prime is 187423. The next prime is 187433. The reversal of 187428 is 824781.

It is an interprime number because it is at equal distance from previous prime (187423) and next prime (187433).

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 187395 and 187404.

It is not an unprimeable number, because it can be changed into a prime (187423) by changing a digit.

187428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7798 + ... + 7821.

2¹⁸⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

187428 is an abundant number, since it is smaller than the sum of its proper divisors (249932).

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

187428 is a wasteful number, since it uses less digits than its factorization.

187428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15626 (or 15624 counting only the distinct ones).

The product of its digits is 3584, while the sum is 30.

The square root of 187428 is about 432.9295554706. The cubic root of 187428 is about 57.2283850186.

The spelling of 187428 in words is "one hundred eighty-seven thousand, four hundred twenty-eight".