180640730 has 8 divisors (see below), whose sum is σ = 325153332. Its totient is φ = 72256288.

The previous prime is 180640729. The next prime is 180640799. The reversal of 180640730 is 37046081.

It can be written as a sum of positive squares in 2 ways, for example, as 150577441 + 30063289 = 12271^2 + 5483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 180640693 and 180640702.

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, 9032027 + ... + 9032046.

Almost surely, 2^180640730 is an apocalyptic number.

180640730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

180640730 is a deficient number, since it is larger than the sum of its proper divisors (144512602).

180640730 is a wasteful number, since it uses less digits than its factorization.

180640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18064080.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 180640730 is about 13440.2652503587. The cubic root of 180640730 is about 565.2907684438.

The spelling of 180640730 in words is "one hundred eighty million, six hundred forty thousand, seven hundred thirty".