1289681280 has 96 divisors (see below), whose sum is σ = 4453450560. Its totient is φ = 343913472.

The previous prime is 1289681273. The next prime is 1289681311. The reversal of 1289681280 is 821869821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 106192 + ... + 117711.

It is an arithmetic number, because the mean of its divisors is an integer number (46390110).

Almost surely, 2^1289681280 is an apocalyptic number.

1289681280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289681280 is an abundant number, since it is smaller than the sum of its proper divisors (3163769280).

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

1289681280 is a wasteful number, since it uses less digits than its factorization.

1289681280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223928 (or 223913 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 1289681280 is about 35912.1327687454. The cubic root of 1289681280 is about 1088.4975737369.

The spelling of 1289681280 in words is "one billion, two hundred eighty-nine million, six hundred eighty-one thousand, two hundred eighty".