1681642630 has 16 divisors (see below), whose sum is σ = 3027423600. Its totient is φ = 672553312.

The previous prime is 1681642607. The next prime is 1681642639. The reversal of 1681642630 is 362461861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681642630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681642639) 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, 122472 + ... + 135508.

It is an arithmetic number, because the mean of its divisors is an integer number (189213975).

Almost surely, 2^1681642630 is an apocalyptic number.

1681642630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681642630 is a deficient number, since it is larger than the sum of its proper divisors (1345780970).

1681642630 is a wasteful number, since it uses less digits than its factorization.

1681642630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25943.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1681642630 is about 41007.8362023650. The cubic root of 1681642630 is about 1189.1717113496.

The spelling of 1681642630 in words is "one billion, six hundred eighty-one million, six hundred forty-two thousand, six hundred thirty".