1621705712 has 40 divisors (see below), whose sum is σ = 3576735360. Its totient is φ = 705087680.

The previous prime is 1621705711. The next prime is 1621705739. The reversal of 1621705712 is 2175071261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621705711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196262 + ... + 204357.

It is an arithmetic number, because the mean of its divisors is an integer number (89418384).

Almost surely, 2^1621705712 is an apocalyptic number.

It is an amenable number.

1621705712 is an abundant number, since it is smaller than the sum of its proper divisors (1955029648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621705712 is a wasteful number, since it uses less digits than its factorization.

1621705712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400661 (or 400655 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 1621705712 is about 40270.4073979889. The cubic root of 1621705712 is about 1174.8723475628.

Adding to 1621705712 its reverse (2175071261), we get a palindrome (3796776973).

The spelling of 1621705712 in words is "one billion, six hundred twenty-one million, seven hundred five thousand, seven hundred twelve".