1681724650 has 12 divisors (see below), whose sum is σ = 3128007942. Its totient is φ = 672689840.

The previous prime is 1681724573. The next prime is 1681724651. The reversal of 1681724650 is 564271861.

It can be written as a sum of positive squares in 3 ways, for example, as 1636445209 + 45279441 = 40453^2 + 6729^2 .

It is not an unprimeable number, because it can be changed into a prime (1681724651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16817197 + ... + 16817296.

Almost surely, 2^1681724650 is an apocalyptic number.

1681724650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681724650 is a deficient number, since it is larger than the sum of its proper divisors (1446283292).

1681724650 is a wasteful number, since it uses less digits than its factorization.

1681724650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33634505 (or 33634500 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1681724650 is about 41008.8362429367. The cubic root of 1681724650 is about 1189.1910444858.

The spelling of 1681724650 in words is "one billion, six hundred eighty-one million, seven hundred twenty-four thousand, six hundred fifty".