1168821828 has 36 divisors (see below), whose sum is σ = 2980678428. Its totient is φ = 386158080.

The previous prime is 1168821821. The next prime is 1168821833. The reversal of 1168821828 is 8281288611.

It can be written as a sum of positive squares in 2 ways, for example, as 651168324 + 517653504 = 25518^2 + 22752^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1168821828² = 2732288931218523168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1168821821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139593 + ... + 147728.

It is an arithmetic number, because the mean of its divisors is an integer number (82796623).

Almost surely, 2^1168821828 is an apocalyptic number.

1168821828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1168821828 is an abundant number, since it is smaller than the sum of its proper divisors (1811856600).

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

1168821828 is a wasteful number, since it uses less digits than its factorization.

1168821828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287444 (or 287439 counting only the distinct ones).

The product of its digits is 98304, while the sum is 45.

The square root of 1168821828 is about 34188.0363285170. The cubic root of 1168821828 is about 1053.3744281978.

The spelling of 1168821828 in words is "one billion, one hundred sixty-eight million, eight hundred twenty-one thousand, eight hundred twenty-eight".