1165860864 has 280 divisors, whose sum is σ = 3996403488. Its totient is φ = 331776000.

The previous prime is 1165860863. The next prime is 1165860947. The reversal of 1165860864 is 4680685611.

1165860864 is a `hidden beast` number, since 1 + 1 + 6 + 586 + 0 + 8 + 64 = 666.

It is not an unprimeable number, because it can be changed into a prime (1165860863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4644739 + ... + 4644989.

Almost surely, 2^1165860864 is an apocalyptic number.

1165860864 is a gapful number since it is divisible by the number (14) 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 1165860864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1998201744).

1165860864 is an abundant number, since it is smaller than the sum of its proper divisors (2830542624).

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

1165860864 is an frugal number, since it uses more digits than its factorization.

1165860864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1165860864 is about 34144.7047724827. The cubic root of 1165860864 is about 1052.4841752444.

The spelling of 1165860864 in words is "one billion, one hundred sixty-five million, eight hundred sixty thousand, eight hundred sixty-four".