181990064 has 10 divisors (see below), whose sum is σ = 352605780. Its totient is φ = 90995024.

The previous prime is 181990031. The next prime is 181990069. The reversal of 181990064 is 460099181.

It is a happy number.

181990064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181990069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5687174 + ... + 5687205.

It is an arithmetic number, because the mean of its divisors is an integer number (35260578).

Almost surely, 2^181990064 is an apocalyptic number.

It is an amenable number.

181990064 is a deficient number, since it is larger than the sum of its proper divisors (170615716).

181990064 is a wasteful number, since it uses less digits than its factorization.

181990064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374387 (or 11374381 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 181990064 is about 13490.3693055453. The cubic root of 181990064 is about 566.6947978345.

The spelling of 181990064 in words is "one hundred eighty-one million, nine hundred ninety thousand, sixty-four".