180725805 has 24 divisors (see below), whose sum is σ = 337355928. Its totient is φ = 88972416.

The previous prime is 180725801. The next prime is 180725833. The reversal of 180725805 is 508527081.

180725805 is a `hidden beast` number, since 1 + 8 + 0 + 72 + 580 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3143529 + 177582276 = 1773^2 + 13326^2 .

It is not a de Polignac number, because 180725805 - 2² = 180725801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 180725805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180725801) 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 23 ways as a sum of consecutive naturals, for example, 153882 + ... + 155051.

It is an arithmetic number, because the mean of its divisors is an integer number (14056497).

Almost surely, 2^180725805 is an apocalyptic number.

180725805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

180725805 is a deficient number, since it is larger than the sum of its proper divisors (156630123).

180725805 is a wasteful number, since it uses less digits than its factorization.

180725805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308957 (or 308954 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 180725805 is about 13443.4298079024. The cubic root of 180725805 is about 565.3794980901.

It can be divided in two parts, 180 and 725805, that multiplied together give a square (130644900 = 11430²).

The spelling of 180725805 in words is "one hundred eighty million, seven hundred twenty-five thousand, eight hundred five".