180997887 has 32 divisors (see below), whose sum is σ = 281774592. Its totient is φ = 101211264.

The previous prime is 180997849. The next prime is 180997913. The reversal of 180997887 is 788799081.

It is not a de Polignac number, because 180997887 - 2⁶ = 180997823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180997087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276853 + ... + 277505.

It is an arithmetic number, because the mean of its divisors is an integer number (8805456).

Almost surely, 2^180997887 is an apocalyptic number.

180997887 is a deficient number, since it is larger than the sum of its proper divisors (100776705).

180997887 is a wasteful number, since it uses less digits than its factorization.

180997887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its (nonzero) digits is 2032128, while the sum is 57.

The square root of 180997887 is about 13453.5455178180. The cubic root of 180997887 is about 565.6630813753.

The spelling of 180997887 in words is "one hundred eighty million, nine hundred ninety-seven thousand, eight hundred eighty-seven".