180668638 has 8 divisors (see below), whose sum is σ = 272517480. Its totient is φ = 89829480.

The previous prime is 180668633. The next prime is 180668681. The reversal of 180668638 is 836866081.

It is a happy number.

180668638 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a super-4 number, since 4×180668638⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180668633) 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, 251973 + ... + 252688.

It is an arithmetic number, because the mean of its divisors is an integer number (34064685).

Almost surely, 2^180668638 is an apocalyptic number.

180668638 is a deficient number, since it is larger than the sum of its proper divisors (91848842).

180668638 is a wasteful number, since it uses less digits than its factorization.

180668638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504842.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 180668638 is about 13441.3034338192. The cubic root of 180668638 is about 565.3198783838.

The spelling of 180668638 in words is "one hundred eighty million, six hundred sixty-eight thousand, six hundred thirty-eight".