1276840728 has 96 divisors (see below), whose sum is σ = 3560693760. Its totient is φ = 413138880.

The previous prime is 1276840711. The next prime is 1276840759. The reversal of 1276840728 is 8270486721.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 428283 + ... + 431253.

It is an arithmetic number, because the mean of its divisors is an integer number (37090560).

Almost surely, 2^1276840728 is an apocalyptic number.

1276840728 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 1276840728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1780346880).

1276840728 is an abundant number, since it is smaller than the sum of its proper divisors (2283853032).

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

1276840728 is a wasteful number, since it uses less digits than its factorization.

1276840728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157 (or 3150 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 1276840728 is about 35732.9081939884. The cubic root of 1276840728 is about 1084.8730207393.

The spelling of 1276840728 in words is "one billion, two hundred seventy-six million, eight hundred forty thousand, seven hundred twenty-eight".