181768140 has 72 divisors (see below), whose sum is σ = 552464640. Its totient is φ = 48374784.

The previous prime is 181768099. The next prime is 181768141. The reversal of 181768140 is 41867181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 181768095 and 181768104.

It is not an unprimeable number, because it can be changed into a prime (181768141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166677 + ... + 167763.

It is an arithmetic number, because the mean of its divisors is an integer number (7673120).

Almost surely, 2^181768140 is an apocalyptic number.

181768140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181768140 is an abundant number, since it is smaller than the sum of its proper divisors (370696500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181768140 is a wasteful number, since it uses less digits than its factorization.

181768140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 181768140 is about 13482.1415212866. The cubic root of 181768140 is about 566.4643560767.

The spelling of 181768140 in words is "one hundred eighty-one million, seven hundred sixty-eight thousand, one hundred forty".