1161330780 has 24 divisors (see below), whose sum is σ = 3251726352. Its totient is φ = 309688192.

The previous prime is 1161330761. The next prime is 1161330791. The reversal of 1161330780 is 870331611.

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

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9677697 + ... + 9677816.

It is an arithmetic number, because the mean of its divisors is an integer number (135488598).

Almost surely, 2^1161330780 is an apocalyptic number.

1161330780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161330780 is an abundant number, since it is smaller than the sum of its proper divisors (2090395572).

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

1161330780 is a wasteful number, since it uses less digits than its factorization.

1161330780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19355525 (or 19355523 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1161330780 is about 34078.3036549650. The cubic root of 1161330780 is about 1051.1192237983.

It can be divided in two parts, 116 and 1330780, that added together give a triangular number (1330896 = T₁₆₃₁).

The spelling of 1161330780 in words is "one billion, one hundred sixty-one million, three hundred thirty thousand, seven hundred eighty".