171187428 has 12 divisors (see below), whose sum is σ = 399437360. Its totient is φ = 57062472.

The previous prime is 171187421. The next prime is 171187451. The reversal of 171187428 is 824781171.

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

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (171187421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7132798 + ... + 7132821.

Almost surely, 2^171187428 is an apocalyptic number.

It is an amenable number.

171187428 is an abundant number, since it is smaller than the sum of its proper divisors (228249932).

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

171187428 is a wasteful number, since it uses less digits than its factorization.

171187428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14265626 (or 14265624 counting only the distinct ones).

The product of its digits is 25088, while the sum is 39.

The square root of 171187428 is about 13083.8613566485. The cubic root of 171187428 is about 555.2526274626.

The spelling of 171187428 in words is "one hundred seventy-one million, one hundred eighty-seven thousand, four hundred twenty-eight".