181864806 has 8 divisors (see below), whose sum is σ = 363729624. Its totient is φ = 60621600.

The previous prime is 181864801. The next prime is 181864831. The reversal of 181864806 is 608468181.

181864806 is digitally balanced in base 2, because in such base 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.

181864806 is an admirable number.

It is a super-2 number, since 2×181864806² = 66149615322835272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181864801) 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, 15155395 + ... + 15155406.

It is an arithmetic number, because the mean of its divisors is an integer number (45466203).

Almost surely, 2^181864806 is an apocalyptic number.

181864806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

181864806 is a wasteful number, since it uses less digits than its factorization.

181864806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30310806.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 181864806 is about 13485.7260093775. The cubic root of 181864806 is about 566.5647552985.

The spelling of 181864806 in words is "one hundred eighty-one million, eight hundred sixty-four thousand, eight hundred six".