1620476645 has 24 divisors (see below), whose sum is σ = 2038641696. Its totient is φ = 1236331712.

The previous prime is 1620476633. The next prime is 1620476653. The reversal of 1620476645 is 5466740261.

It is a happy number.

It is not a de Polignac number, because 1620476645 - 2¹⁶ = 1620411109 is a prime.

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 346694 + ... + 351336.

It is an arithmetic number, because the mean of its divisors is an integer number (84943404).

Almost surely, 2^1620476645 is an apocalyptic number.

It is an amenable number.

1620476645 is a deficient number, since it is larger than the sum of its proper divisors (418165051).

1620476645 is an equidigital number, since it uses as much as digits as its factorization.

1620476645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789 (or 4760 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 1620476645 is about 40255.1443296382. The cubic root of 1620476645 is about 1174.5754663697.

The spelling of 1620476645 in words is "one billion, six hundred twenty million, four hundred seventy-six thousand, six hundred forty-five".