1728613989 has 12 divisors (see below), whose sum is σ = 2564370796. Its totient is φ = 1121262912.

The previous prime is 1728613973. The next prime is 1728614021. The reversal of 1728613989 is 9893168271.

1728613989 is a `hidden beast` number, since 17 + 2 + 8 + 613 + 9 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 627502500 + 1101111489 = 25050^2 + 33183^2 .

It is not a de Polignac number, because 1728613989 - 2⁴ = 1728613973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728613949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2595184 + ... + 2595849.

Almost surely, 2^1728613989 is an apocalyptic number.

It is an amenable number.

1728613989 is a deficient number, since it is larger than the sum of its proper divisors (835756807).

1728613989 is a wasteful number, since it uses less digits than its factorization.

1728613989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5191076 (or 5191073 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1728613989 is about 41576.6038656358. The cubic root of 1728613989 is about 1200.1421102532.

The spelling of 1728613989 in words is "one billion, seven hundred twenty-eight million, six hundred thirteen thousand, nine hundred eighty-nine".