180685990 has 8 divisors (see below), whose sum is σ = 325234800. Its totient is φ = 72274392.

The previous prime is 180685987. The next prime is 180685993. The reversal of 180685990 is 99586081.

It is an interprime number because it is at equal distance from previous prime (180685987) and next prime (180685993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 180685990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180685993) 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, 9034290 + ... + 9034309.

It is an arithmetic number, because the mean of its divisors is an integer number (40654350).

Almost surely, 2^180685990 is an apocalyptic number.

180685990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

180685990 is a deficient number, since it is larger than the sum of its proper divisors (144548810).

180685990 is a wasteful number, since it uses less digits than its factorization.

180685990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18068606.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 180685990 is about 13441.9488914368. The cubic root of 180685990 is about 565.3379761872.

The spelling of 180685990 in words is "one hundred eighty million, six hundred eighty-five thousand, nine hundred ninety".