1163642780 has 48 divisors (see below), whose sum is σ = 2508290400. Its totient is φ = 453212928.

The previous prime is 1163642759. The next prime is 1163642789. The reversal of 1163642780 is 872463611.

It is a super-2 number, since 2×1163642780² = 2708129038892256800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163642789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298202 + ... + 302078.

It is an arithmetic number, because the mean of its divisors is an integer number (52256050).

Almost surely, 2^1163642780 is an apocalyptic number.

1163642780 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 1163642780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254145200).

1163642780 is an abundant number, since it is smaller than the sum of its proper divisors (1344647620).

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

1163642780 is a wasteful number, since it uses less digits than its factorization.

1163642780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278 (or 4276 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1163642780 is about 34112.2086649340. The cubic root of 1163642780 is about 1051.8162909849.

The spelling of 1163642780 in words is "one billion, one hundred sixty-three million, six hundred forty-two thousand, seven hundred eighty".