1989660672 has 156 divisors (see below), whose sum is σ = 5963048000. Its totient is φ = 662888448.

The previous prime is 1989660661. The next prime is 1989660689. The reversal of 1989660672 is 2760669891.

1989660672 = T₂₈₈ + T₂₈₉ + ... + T₂₂₈₆.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 994329 + ... + 996327.

Almost surely, 2^1989660672 is an apocalyptic number.

1989660672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989660672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2981524000).

1989660672 is an abundant number, since it is smaller than the sum of its proper divisors (3973387328).

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

1989660672 is an frugal number, since it uses more digits than its factorization.

1989660672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 1989660672 is about 44605.6125616497. The cubic root of 1989660672 is about 1257.7461749558.

The spelling of 1989660672 in words is "one billion, nine hundred eighty-nine million, six hundred sixty thousand, six hundred seventy-two".