1089997776 has 320 divisors, whose sum is σ = 3837849600. Its totient is φ = 289267200.

The previous prime is 1089997759. The next prime is 1089997781. The reversal of 1089997776 is 6777999801.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3504661 + ... + 3504971.

It is an arithmetic number, because the mean of its divisors is an integer number (11993280).

Almost surely, 2^1089997776 is an apocalyptic number.

1089997776 is a gapful number since it is divisible by the number (16) 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 1089997776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918924800).

1089997776 is an abundant number, since it is smaller than the sum of its proper divisors (2747851824).

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

1089997776 is a wasteful number, since it uses less digits than its factorization.

1089997776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 63.

The square root of 1089997776 is about 33015.1143569124. The cubic root of 1089997776 is about 1029.1417666283.

The spelling of 1089997776 in words is "one billion, eighty-nine million, nine hundred ninety-seven thousand, seven hundred seventy-six".