181047864 has 16 divisors (see below), whose sum is σ = 452619720. Its totient is φ = 60349280.

The previous prime is 181047863. The next prime is 181047871. The reversal of 181047864 is 468740181.

It is a super-3 number, since 3×181047864³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181047863) 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, 3771807 + ... + 3771854.

Almost surely, 2^181047864 is an apocalyptic number.

It is an amenable number.

181047864 is an abundant number, since it is smaller than the sum of its proper divisors (271571856).

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

181047864 is a wasteful number, since it uses less digits than its factorization.

181047864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543670 (or 7543666 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 181047864 is about 13455.4027810393. The cubic root of 181047864 is about 565.7151400719.

The spelling of 181047864 in words is "one hundred eighty-one million, forty-seven thousand, eight hundred sixty-four".