1089444720 has 320 divisors, whose sum is σ = 4213730304. Its totient is φ = 226713600.

The previous prime is 1089444691. The next prime is 1089444721. The reversal of 1089444720 is 274449801.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089444721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1812420 + ... + 1813020.

Almost surely, 2^1089444720 is an apocalyptic number.

1089444720 is a gapful number since it is divisible by the number (10) 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 1089444720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106865152).

1089444720 is an abundant number, since it is smaller than the sum of its proper divisors (3124285584).

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

1089444720 is a wasteful number, since it uses less digits than its factorization.

1089444720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1089444720 is about 33006.7374940329. The cubic root of 1089444720 is about 1028.9676777958.

The spelling of 1089444720 in words is "one billion, eighty-nine million, four hundred forty-four thousand, seven hundred twenty".