1620931682 has 4 divisors (see below), whose sum is σ = 2431397526. Its totient is φ = 810465840.

The previous prime is 1620931673. The next prime is 1620931687. The reversal of 1620931682 is 2861390261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1283144041 + 337787641 = 35821^2 + 18379^2 .

It is a super-2 number, since 2×1620931682² = 5254839035422698248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1620931687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405232919 + ... + 405232922.

Almost surely, 2^1620931682 is an apocalyptic number.

1620931682 is a deficient number, since it is larger than the sum of its proper divisors (810465844).

1620931682 is an equidigital number, since it uses as much as digits as its factorization.

1620931682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810465843.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1620931682 is about 40260.7958440963. The cubic root of 1620931682 is about 1174.6853980737.

The spelling of 1620931682 in words is "one billion, six hundred twenty million, nine hundred thirty-one thousand, six hundred eighty-two".