1620344645 has 8 divisors (see below), whose sum is σ = 1945018656. Its totient is φ = 1295872336.

The previous prime is 1620344639. The next prime is 1620344653. The reversal of 1620344645 is 5464430261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620344645 - 2⁶ = 1620344581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32147 + ... + 65376.

It is an arithmetic number, because the mean of its divisors is an integer number (243127332).

Almost surely, 2^1620344645 is an apocalyptic number.

It is an amenable number.

1620344645 is a deficient number, since it is larger than the sum of its proper divisors (324674011).

1620344645 is an equidigital number, since it uses as much as digits as its factorization.

1620344645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100851.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1620344645 is about 40253.5047542447. The cubic root of 1620344645 is about 1174.5435728376.

The spelling of 1620344645 in words is "one billion, six hundred twenty million, three hundred forty-four thousand, six hundred forty-five".