187645745 has 24 divisors (see below), whose sum is σ = 277352424. Its totient is φ = 121099776.

The previous prime is 187645741. The next prime is 187645769. The reversal of 187645745 is 547546781.

It can be written as a sum of positive squares in 4 ways, for example, as 53919649 + 133726096 = 7343^2 + 11564^2 .

It is not a de Polignac number, because 187645745 - 2² = 187645741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 187645745.

It is not an unprimeable number, because it can be changed into a prime (187645741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18362 + ... + 26691.

It is an arithmetic number, because the mean of its divisors is an integer number (11556351).

Almost surely, 2^187645745 is an apocalyptic number.

It is an amenable number.

187645745 is a deficient number, since it is larger than the sum of its proper divisors (89706679).

187645745 is a wasteful number, since it uses less digits than its factorization.

187645745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45089 (or 45082 counting only the distinct ones).

The product of its digits is 940800, while the sum is 47.

The square root of 187645745 is about 13698.3847587955. The cubic root of 187645745 is about 572.5053818707.

The spelling of 187645745 in words is "one hundred eighty-seven million, six hundred forty-five thousand, seven hundred forty-five".