1620362889 has 6 divisors (see below), whose sum is σ = 2340524186. Its totient is φ = 1080241920.

The previous prime is 1620362881. The next prime is 1620362899. The reversal of 1620362889 is 9882630261.

1620362889 is a `hidden beast` number, since 16 + 2 + 0 + 3 + 628 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1351665225 + 268697664 = 36765^2 + 16392^2 .

It is not a de Polignac number, because 1620362889 - 2³ = 1620362881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620362881) 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, 90020152 + ... + 90020169.

Almost surely, 2^1620362889 is an apocalyptic number.

It is an amenable number.

1620362889 is a deficient number, since it is larger than the sum of its proper divisors (720161297).

1620362889 is a wasteful number, since it uses less digits than its factorization.

1620362889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180040327 (or 180040324 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1620362889 is about 40253.7313674149. The cubic root of 1620362889 is about 1174.5479810135.

The spelling of 1620362889 in words is "one billion, six hundred twenty million, three hundred sixty-two thousand, eight hundred eighty-nine".