1620368605 has 16 divisors (see below), whose sum is σ = 2032588800. Its totient is φ = 1238590080.

The previous prime is 1620368597. The next prime is 1620368609. The reversal of 1620368605 is 5068630261.

It is not a de Polignac number, because 1620368605 - 2³ = 1620368597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620368609) 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, 53920 + ... + 78409.

It is an arithmetic number, because the mean of its divisors is an integer number (127036800).

Almost surely, 2^1620368605 is an apocalyptic number.

It is an amenable number.

1620368605 is a deficient number, since it is larger than the sum of its proper divisors (412220195).

1620368605 is a wasteful number, since it uses less digits than its factorization.

1620368605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132444.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1620368605 is about 40253.8023669814. The cubic root of 1620368605 is about 1174.5493621256.

Adding to 1620368605 its reverse (5068630261), we get a palindrome (6688998866).

The spelling of 1620368605 in words is "one billion, six hundred twenty million, three hundred sixty-eight thousand, six hundred five".