1131267720 has 192 divisors, whose sum is σ = 3950674560. Its totient is φ = 258058240.

The previous prime is 1131267713. The next prime is 1131267751. The reversal of 1131267720 is 277621311.

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 47 ways as a sum of consecutive naturals, for example, 244549 + ... + 249131.

It is an arithmetic number, because the mean of its divisors is an integer number (20576430).

Almost surely, 2^1131267720 is an apocalyptic number.

1131267720 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 1131267720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975337280).

1131267720 is an abundant number, since it is smaller than the sum of its proper divisors (2819406840).

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

1131267720 is a wasteful number, since it uses less digits than its factorization.

1131267720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 4621 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1131267720 is about 33634.3235400981. The cubic root of 1131267720 is about 1041.9697998058.

The spelling of 1131267720 in words is "one billion, one hundred thirty-one million, two hundred sixty-seven thousand, seven hundred twenty".