1286732880 has 60 divisors (see below), whose sum is σ = 4321280340. Its totient is φ = 343128576.

The previous prime is 1286732879. The next prime is 1286732891. The reversal of 1286732880 is 882376821.

It can be written as a sum of positive squares in 2 ways, for example, as 373726224 + 913006656 = 19332^2 + 30216^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 892845 + ... + 894284.

It is an arithmetic number, because the mean of its divisors is an integer number (72021339).

Almost surely, 2^1286732880 is an apocalyptic number.

1286732880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286732880 is an abundant number, since it is smaller than the sum of its proper divisors (3034547460).

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

1286732880 is a wasteful number, since it uses less digits than its factorization.

1286732880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787148 (or 1787139 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1286732880 is about 35871.0590866788. The cubic root of 1286732880 is about 1087.6674526132.

The spelling of 1286732880 in words is "one billion, two hundred eighty-six million, seven hundred thirty-two thousand, eight hundred eighty".