1157081780 has 12 divisors (see below), whose sum is σ = 2429871780. Its totient is φ = 462832704.

The previous prime is 1157081747. The next prime is 1157081803. The reversal of 1157081780 is 871807511.

It can be written as a sum of positive squares in 2 ways, for example, as 685497124 + 471584656 = 26182^2 + 21716^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 28927025 + ... + 28927064.

It is an arithmetic number, because the mean of its divisors is an integer number (202489315).

Almost surely, 2^1157081780 is an apocalyptic number.

1157081780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1157081780 is an abundant number, since it is smaller than the sum of its proper divisors (1272790000).

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

1157081780 is a wasteful number, since it uses less digits than its factorization.

1157081780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57854098 (or 57854096 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 38.

The square root of 1157081780 is about 34015.9048093682. The cubic root of 1157081780 is about 1049.8357354523.

The spelling of 1157081780 in words is "one billion, one hundred fifty-seven million, eighty-one thousand, seven hundred eighty".