1161623320 has 128 divisors (see below), whose sum is σ = 3170119680. Its totient is φ = 377280000.

The previous prime is 1161623317. The next prime is 1161623327. The reversal of 1161623320 is 233261611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161623327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174045 + ... + 180595.

It is an arithmetic number, because the mean of its divisors is an integer number (24766560).

Almost surely, 2^1161623320 is an apocalyptic number.

1161623320 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 1161623320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1585059840).

1161623320 is an abundant number, since it is smaller than the sum of its proper divisors (2008496360).

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

1161623320 is a wasteful number, since it uses less digits than its factorization.

1161623320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617 (or 6613 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1161623320 is about 34082.5955584372. The cubic root of 1161623320 is about 1051.2074756003.

Adding to 1161623320 its reverse (233261611), we get a palindrome (1394884931).

The spelling of 1161623320 in words is "one billion, one hundred sixty-one million, six hundred twenty-three thousand, three hundred twenty".