1081778688 has 240 divisors, whose sum is σ = 3332197440. Its totient is φ = 337108992.

The previous prime is 1081778683. The next prime is 1081778723. The reversal of 1081778688 is 8868771801.

It is a happy number.

It is a super-2 number, since 2×1081778688² = 2340490259622002688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1081778683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6252970 + ... + 6253142.

It is an arithmetic number, because the mean of its divisors is an integer number (13884156).

Almost surely, 2^1081778688 is an apocalyptic number.

1081778688 is a gapful number since it is divisible by the number (18) 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 1081778688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1666098720).

1081778688 is an abundant number, since it is smaller than the sum of its proper divisors (2250418752).

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

1081778688 is a wasteful number, since it uses less digits than its factorization.

1081778688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 54.

The square root of 1081778688 is about 32890.4041933206. The cubic root of 1081778688 is about 1026.5485023577.

The spelling of 1081778688 in words is "one billion, eighty-one million, seven hundred seventy-eight thousand, six hundred eighty-eight".