1155776980 has 12 divisors (see below), whose sum is σ = 2427131700. Its totient is φ = 462310784.

The previous prime is 1155776971. The next prime is 1155777017. The reversal of 1155776980 is 896775511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 143137296 + 1012639684 = 11964^2 + 31822^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28894405 + ... + 28894444.

It is an arithmetic number, because the mean of its divisors is an integer number (202260975).

Almost surely, 2^1155776980 is an apocalyptic number.

1155776980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155776980 is an abundant number, since it is smaller than the sum of its proper divisors (1271354720).

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

1155776980 is a wasteful number, since it uses less digits than its factorization.

1155776980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57788858 (or 57788856 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 49.

The square root of 1155776980 is about 33996.7201359190. The cubic root of 1155776980 is about 1049.4409662103.

The spelling of 1155776980 in words is "one billion, one hundred fifty-five million, seven hundred seventy-six thousand, nine hundred eighty".