181264660 has 12 divisors (see below), whose sum is σ = 380655828. Its totient is φ = 72505856.

The previous prime is 181264637. The next prime is 181264661. The reversal of 181264660 is 66462181.

181264660 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 121264144 + 60000516 = 11012^2 + 7746^2 .

181264660 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181264661) 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 3 ways as a sum of consecutive naturals, for example, 4531597 + ... + 4531636.

It is an arithmetic number, because the mean of its divisors is an integer number (31721319).

Almost surely, 2^181264660 is an apocalyptic number.

181264660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181264660 is an abundant number, since it is smaller than the sum of its proper divisors (199391168).

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

181264660 is a wasteful number, since it uses less digits than its factorization.

181264660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9063242 (or 9063240 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 181264660 is about 13463.4564655589. The cubic root of 181264660 is about 565.9408554446.

The spelling of 181264660 in words is "one hundred eighty-one million, two hundred sixty-four thousand, six hundred sixty".