1280133540 has 288 divisors, whose sum is σ = 4676345856. Its totient is φ = 277136640.

The previous prime is 1280133523. The next prime is 1280133551. The reversal of 1280133540 is 453310821.

It is a happy number.

1280133540 is a `hidden beast` number, since 12 + 80 + 1 + 33 + 540 = 666.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 4723605 + ... + 4723875.

It is an arithmetic number, because the mean of its divisors is an integer number (16237312).

Almost surely, 2^1280133540 is an apocalyptic number.

1280133540 is a gapful number since it is divisible by the number (10) 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 1280133540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2338172928).

1280133540 is an abundant number, since it is smaller than the sum of its proper divisors (3396212316).

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

1280133540 is a wasteful number, since it uses less digits than its factorization.

1280133540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1280133540 is about 35778.9538695586. The cubic root of 1280133540 is about 1085.8048040050.

The spelling of 1280133540 in words is "one billion, two hundred eighty million, one hundred thirty-three thousand, five hundred forty".