1281775968 has 96 divisors (see below), whose sum is σ = 4078408320. Its totient is φ = 388414080.

The previous prime is 1281775961. The next prime is 1281775987. The reversal of 1281775968 is 8695771821.

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 (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281775961) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 57930 + ... + 76937.

It is an arithmetic number, because the mean of its divisors is an integer number (42483420).

Almost surely, 2^1281775968 is an apocalyptic number.

1281775968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1281775968 is an abundant number, since it is smaller than the sum of its proper divisors (2796632352).

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

1281775968 is a wasteful number, since it uses less digits than its factorization.

1281775968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134897 (or 134883 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 1281775968 is about 35801.8989440504. The cubic root of 1281775968 is about 1086.2689727838.

The spelling of 1281775968 in words is "one billion, two hundred eighty-one million, seven hundred seventy-five thousand, nine hundred sixty-eight".