1218780760 has 32 divisors (see below), whose sum is σ = 2809144800. Its totient is φ = 475621120.

The previous prime is 1218780757. The next prime is 1218780811. The reversal of 1218780760 is 670878121.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369940 + ... + 373219.

It is an arithmetic number, because the mean of its divisors is an integer number (87785775).

Almost surely, 2^1218780760 is an apocalyptic number.

1218780760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218780760 is an abundant number, since it is smaller than the sum of its proper divisors (1590364040).

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

1218780760 is a wasteful number, since it uses less digits than its factorization.

1218780760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743211 (or 743207 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 1218780760 is about 34911.0406605131. The cubic root of 1218780760 is about 1068.1736568091.

The spelling of 1218780760 in words is "one billion, two hundred eighteen million, seven hundred eighty thousand, seven hundred sixty".