1281728364 has 24 divisors (see below), whose sum is σ = 3417942528. Its totient is φ = 366208080.

The previous prime is 1281728333. The next prime is 1281728389. The reversal of 1281728364 is 4638271821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7629252 + ... + 7629419.

It is an arithmetic number, because the mean of its divisors is an integer number (142414272).

Almost surely, 2^1281728364 is an apocalyptic number.

1281728364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1281728364 is an abundant number, since it is smaller than the sum of its proper divisors (2136214164).

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

1281728364 is a wasteful number, since it uses less digits than its factorization.

1281728364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15258685 (or 15258683 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 1281728364 is about 35801.2341128068. The cubic root of 1281728364 is about 1086.2555249350.

The spelling of 1281728364 in words is "one billion, two hundred eighty-one million, seven hundred twenty-eight thousand, three hundred sixty-four".