1620454445 has 8 divisors (see below), whose sum is σ = 1944764640. Its totient is φ = 1296217360.

The previous prime is 1620454421. The next prime is 1620454453. The reversal of 1620454445 is 5444540261.

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

It is not a de Polignac number, because 1620454445 - 2⁸ = 1620454189 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 64946 + ... + 86364.

It is an arithmetic number, because the mean of its divisors is an integer number (243095580).

Almost surely, 2^1620454445 is an apocalyptic number.

It is an amenable number.

1620454445 is a deficient number, since it is larger than the sum of its proper divisors (324310195).

1620454445 is a wasteful number, since it uses less digits than its factorization.

1620454445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36555.

The product of its (nonzero) digits is 76800, while the sum is 35.

The square root of 1620454445 is about 40254.8685875386. The cubic root of 1620454445 is about 1174.5701025786.

The spelling of 1620454445 in words is "one billion, six hundred twenty million, four hundred fifty-four thousand, four hundred forty-five".