1131428736 has 320 divisors, whose sum is σ = 3598927200. Its totient is φ = 352235520.

The previous prime is 1131428717. The next prime is 1131428737. The reversal of 1131428736 is 6378241311.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1131428736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131428737) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15935581 + ... + 15935651.

Almost surely, 2^1131428736 is an apocalyptic number.

1131428736 is a gapful number since it is divisible by the number (16) 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 1131428736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799463600).

1131428736 is an abundant number, since it is smaller than the sum of its proper divisors (2467498464).

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

1131428736 is an equidigital number, since it uses as much as digits as its factorization.

1131428736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 158 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1131428736 is about 33636.7170811897. The cubic root of 1131428736 is about 1042.0192327994.

The spelling of 1131428736 in words is "one billion, one hundred thirty-one million, four hundred twenty-eight thousand, seven hundred thirty-six".