1161363720 has 64 divisors (see below), whose sum is σ = 3800831040. Its totient is φ = 281542400.

The previous prime is 1161363683. The next prime is 1161363781. The reversal of 1161363720 is 273631611.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438591 + ... + 441230.

It is an arithmetic number, because the mean of its divisors is an integer number (59387985).

Almost surely, 2^1161363720 is an apocalyptic number.

1161363720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161363720 is an abundant number, since it is smaller than the sum of its proper divisors (2639467320).

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

1161363720 is a wasteful number, since it uses less digits than its factorization.

1161363720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879846 (or 879842 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 1161363720 is about 34078.7869502422. The cubic root of 1161363720 is about 1051.1291616904.

The spelling of 1161363720 in words is "one billion, one hundred sixty-one million, three hundred sixty-three thousand, seven hundred twenty".