1288975668 has 12 divisors (see below), whose sum is σ = 3007609920. Its totient is φ = 429658552.

The previous prime is 1288975643. The next prime is 1288975687. The reversal of 1288975668 is 8665798821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1288975668² = 3322916545392092448, which contains 22 as substring.

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, 53707308 + ... + 53707331.

It is an arithmetic number, because the mean of its divisors is an integer number (250634160).

Almost surely, 2^1288975668 is an apocalyptic number.

It is an amenable number.

1288975668 is an abundant number, since it is smaller than the sum of its proper divisors (1718634252).

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

1288975668 is a wasteful number, since it uses less digits than its factorization.

1288975668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107414646 (or 107414644 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 60.

The square root of 1288975668 is about 35902.3072796164. The cubic root of 1288975668 is about 1088.2990241475.

The spelling of 1288975668 in words is "one billion, two hundred eighty-eight million, nine hundred seventy-five thousand, six hundred sixty-eight".