1165598280 has 288 divisors, whose sum is σ = 4808082240. Its totient is φ = 242161920.

The previous prime is 1165598279. The next prime is 1165598297. The reversal of 1165598280 is 828955611.

It is a happy number.

1165598280 is a `hidden beast` number, since 1 + 16 + 559 + 8 + 2 + 80 = 666.

1165598280 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 191037 + ... + 197043.

It is an arithmetic number, because the mean of its divisors is an integer number (16694730).

Almost surely, 2^1165598280 is an apocalyptic number.

1165598280 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 1165598280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2404041120).

1165598280 is an abundant number, since it is smaller than the sum of its proper divisors (3642483960).

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

1165598280 is a wasteful number, since it uses less digits than its factorization.

1165598280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049 (or 6035 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The square root of 1165598280 is about 34140.8593916439. The cubic root of 1165598280 is about 1052.4051531632.

The spelling of 1165598280 in words is "one billion, one hundred sixty-five million, five hundred ninety-eight thousand, two hundred eighty".