1989765008 has 160 divisors (see below), whose sum is σ = 5060247552. Its totient is φ = 735321600.

The previous prime is 1989764993. The next prime is 1989765013. The reversal of 1989765008 is 8005679891.

It is a super-2 number, since 2×1989765008² = 7918329574122480128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2023685 + ... + 2024667.

Almost surely, 2^1989765008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989765008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530123776).

1989765008 is an abundant number, since it is smaller than the sum of its proper divisors (3070482544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989765008 is a wasteful number, since it uses less digits than its factorization.

1989765008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1087 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 1989765008 is about 44606.7820852390. The cubic root of 1989765008 is about 1257.7681595942.

The spelling of 1989765008 in words is "one billion, nine hundred eighty-nine million, seven hundred sixty-five thousand, eight".