1161528390 has 256 divisors, whose sum is σ = 3538391040. Its totient is φ = 268669440.

The previous prime is 1161528373. The next prime is 1161528397. The reversal of 1161528390 is 938251611.

1161528390 is a `hidden beast` number, since 1 + 1 + 615 + 2 + 8 + 39 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161528397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7398192 + ... + 7398348.

It is an arithmetic number, because the mean of its divisors is an integer number (13821840).

Almost surely, 2^1161528390 is an apocalyptic number.

1161528390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1161528390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769195520).

1161528390 is an abundant number, since it is smaller than the sum of its proper divisors (2376862650).

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

1161528390 is a wasteful number, since it uses less digits than its factorization.

1161528390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1161528390 is about 34081.2028837012. The cubic root of 1161528390 is about 1051.1788392823.

The spelling of 1161528390 in words is "one billion, one hundred sixty-one million, five hundred twenty-eight thousand, three hundred ninety".