181345690 has 16 divisors (see below), whose sum is σ = 343602720. Its totient is φ = 68720400.

The previous prime is 181345679. The next prime is 181345699. The reversal of 181345690 is 96543181.

181345690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181345690² = 65772518563152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181345699) 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, 477036 + ... + 477415.

It is an arithmetic number, because the mean of its divisors is an integer number (21475170).

Almost surely, 2^181345690 is an apocalyptic number.

181345690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181345690 is a deficient number, since it is larger than the sum of its proper divisors (162257030).

181345690 is a wasteful number, since it uses less digits than its factorization.

181345690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954477.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 181345690 is about 13466.4653862846. The cubic root of 181345690 is about 566.0251729576.

The spelling of 181345690 in words is "one hundred eighty-one million, three hundred forty-five thousand, six hundred ninety".