181730636 has 12 divisors (see below), whose sum is σ = 331856112. Its totient is φ = 86914608.

The previous prime is 181730621. The next prime is 181730657. The reversal of 181730636 is 636037181.

It is a junction number, because it is equal to n+sod(n) for n = 181730596 and 181730605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987575 + ... + 987758.

It is an arithmetic number, because the mean of its divisors is an integer number (27654676).

Almost surely, 2^181730636 is an apocalyptic number.

It is an amenable number.

181730636 is a deficient number, since it is larger than the sum of its proper divisors (150125476).

181730636 is a wasteful number, since it uses less digits than its factorization.

181730636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975360 (or 1975358 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 181730636 is about 13480.7505725757. The cubic root of 181730636 is about 566.4253940956.

The spelling of 181730636 in words is "one hundred eighty-one million, seven hundred thirty thousand, six hundred thirty-six".