1121880780 has 120 divisors (see below), whose sum is σ = 3540609072. Its totient is φ = 297364608.

The previous prime is 1121880761. The next prime is 1121880791. The reversal of 1121880780 is 870881211.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 278259 + ... + 282261.

Almost surely, 2^1121880780 is an apocalyptic number.

1121880780 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 1121880780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1770304536).

1121880780 is an abundant number, since it is smaller than the sum of its proper divisors (2418728292).

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

1121880780 is a wasteful number, since it uses less digits than its factorization.

1121880780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 1121880780 is about 33494.4888003982. The cubic root of 1121880780 is about 1039.0798011803.

The spelling of 1121880780 in words is "one billion, one hundred twenty-one million, eight hundred eighty thousand, seven hundred eighty".