187428645 has 24 divisors (see below), whose sum is σ = 325236600. Its totient is φ = 99851136.

The previous prime is 187428623. The next prime is 187428649. The reversal of 187428645 is 546824781.

187428645 is a `hidden beast` number, since 187 + 428 + 6 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 126495009 + 60933636 = 11247^2 + 7806^2 .

It is not a de Polignac number, because 187428645 - 2⁵ = 187428613 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 187428645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187428649) 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, 53611 + ... + 56999.

It is an arithmetic number, because the mean of its divisors is an integer number (13551525).

Almost surely, 2^187428645 is an apocalyptic number.

187428645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

187428645 is a deficient number, since it is larger than the sum of its proper divisors (137807955).

187428645 is a wasteful number, since it uses less digits than its factorization.

187428645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629 (or 4626 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 187428645 is about 13690.4581734871. The cubic root of 187428645 is about 572.2845066558.

The spelling of 187428645 in words is "one hundred eighty-seven million, four hundred twenty-eight thousand, six hundred forty-five".