1280273328 has 60 divisors (see below), whose sum is σ = 3599144640. Its totient is φ = 424833408.

The previous prime is 1280273327. The next prime is 1280273341. The reversal of 1280273328 is 8233720821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1280273292 and 1280273301.

It is not an unprimeable number, because it can be changed into a prime (1280273327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12178 + ... + 52046.

It is an arithmetic number, because the mean of its divisors is an integer number (59985744).

Almost surely, 2^1280273328 is an apocalyptic number.

1280273328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280273328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799572320).

1280273328 is an abundant number, since it is smaller than the sum of its proper divisors (2318871312).

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

1280273328 is a wasteful number, since it uses less digits than its factorization.

1280273328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40106 (or 40097 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1280273328 is about 35780.9073110227. The cubic root of 1280273328 is about 1085.8443251312.

The spelling of 1280273328 in words is "one billion, two hundred eighty million, two hundred seventy-three thousand, three hundred twenty-eight".