181864004 has 24 divisors (see below), whose sum is σ = 368336640. Its totient is φ = 76954176.

The previous prime is 181864003. The next prime is 181864021. The reversal of 181864004 is 400468181.

It is not an unprimeable number, because it can be changed into a prime (181864003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38897 + ... + 43320.

It is an arithmetic number, because the mean of its divisors is an integer number (15347360).

Almost surely, 2^181864004 is an apocalyptic number.

181864004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

181864004 is an abundant number, since it is smaller than the sum of its proper divisors (186472636).

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

181864004 is a wasteful number, since it uses less digits than its factorization.

181864004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82307 (or 82305 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 181864004 is about 13485.6962742010. The cubic root of 181864004 is about 566.5639224718.

The spelling of 181864004 in words is "one hundred eighty-one million, eight hundred sixty-four thousand, four".