1191764680 has 16 divisors (see below), whose sum is σ = 2681470620. Its totient is φ = 476705856.

The previous prime is 1191764663. The next prime is 1191764701. The reversal of 1191764680 is 864671911.

It can be written as a sum of positive squares in 2 ways, for example, as 1185975844 + 5788836 = 34438^2 + 2406^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14897019 + ... + 14897098.

Almost surely, 2^1191764680 is an apocalyptic number.

1191764680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191764680 is an abundant number, since it is smaller than the sum of its proper divisors (1489705940).

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

1191764680 is a wasteful number, since it uses less digits than its factorization.

1191764680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29794128 (or 29794124 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1191764680 is about 34521.9449046545. The cubic root of 1191764680 is about 1060.2220609884. Note that the first 3 decimals are identical.

The spelling of 1191764680 in words is "one billion, one hundred ninety-one million, seven hundred sixty-four thousand, six hundred eighty".