1620684061 has 16 divisors (see below), whose sum is σ = 1722603520. Its totient is φ = 1522326960.

The previous prime is 1620684041. The next prime is 1620684083. The reversal of 1620684061 is 1604860261.

It is a cyclic number.

It is not a de Polignac number, because 1620684061 - 2¹¹ = 1620682013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620684011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213550 + ... + 221008.

It is an arithmetic number, because the mean of its divisors is an integer number (107662720).

Almost surely, 2^1620684061 is an apocalyptic number.

It is an amenable number.

1620684061 is a deficient number, since it is larger than the sum of its proper divisors (101919459).

1620684061 is a wasteful number, since it uses less digits than its factorization.

1620684061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1620684061 is about 40257.7205142070. The cubic root of 1620684061 is about 1174.6255782410.

The spelling of 1620684061 in words is "one billion, six hundred twenty million, six hundred eighty-four thousand, sixty-one".