1620980217 has 6 divisors (see below), whose sum is σ = 2341415882. Its totient is φ = 1080653472.

The previous prime is 1620980191. The next prime is 1620980237. The reversal of 1620980217 is 7120890261.

1620980217 is a `hidden beast` number, since 1 + 620 + 9 + 8 + 0 + 21 + 7 = 666.

1620980217 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1588899321 + 32080896 = 39861^2 + 5664^2 .

It is not a de Polignac number, because 1620980217 - 2⁸ = 1620979961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620980237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90054448 + ... + 90054465.

Almost surely, 2^1620980217 is an apocalyptic number.

It is an amenable number.

1620980217 is a deficient number, since it is larger than the sum of its proper divisors (720435665).

1620980217 is a wasteful number, since it uses less digits than its factorization.

1620980217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180108919 (or 180108916 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1620980217 is about 40261.3985971675. The cubic root of 1620980217 is about 1174.6971223570.

The spelling of 1620980217 in words is "one billion, six hundred twenty million, nine hundred eighty thousand, two hundred seventeen".