1620402643 has 12 divisors (see below), whose sum is σ = 1677860184. Its totient is φ = 1564855200.

The previous prime is 1620402629. The next prime is 1620402653. The reversal of 1620402643 is 3462040261.

It is not a de Polignac number, because 1620402643 - 2⁹ = 1620402131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620402613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547255 + ... + 550207.

It is an arithmetic number, because the mean of its divisors is an integer number (139821682).

Almost surely, 2^1620402643 is an apocalyptic number.

1620402643 is a deficient number, since it is larger than the sum of its proper divisors (57457541).

1620402643 is an equidigital number, since it uses as much as digits as its factorization.

1620402643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586 (or 3555 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 1620402643 is about 40254.2251571186. The cubic root of 1620402643 is about 1174.5575863924.

The spelling of 1620402643 in words is "one billion, six hundred twenty million, four hundred two thousand, six hundred forty-three".