1171681680 has 160 divisors (see below), whose sum is σ = 3943747584. Its totient is φ = 286046208.

The previous prime is 1171681639. The next prime is 1171681691. The reversal of 1171681680 is 861861711.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394762 + ... + 397718.

Almost surely, 2^1171681680 is an apocalyptic number.

1171681680 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 1171681680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1971873792).

1171681680 is an abundant number, since it is smaller than the sum of its proper divisors (2772065904).

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

1171681680 is a wasteful number, since it uses less digits than its factorization.

1171681680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3107 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 39.

The square root of 1171681680 is about 34229.8361082842. The cubic root of 1171681680 is about 1054.2328542513.

The spelling of 1171681680 in words is "one billion, one hundred seventy-one million, six hundred eighty-one thousand, six hundred eighty".