1276697856 has 288 divisors, whose sum is σ = 4238438400. Its totient is φ = 332881920.

The previous prime is 1276697813. The next prime is 1276697857. The reversal of 1276697856 is 6587966721.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 1276697796 and 1276697805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276697857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2961961 + ... + 2962391.

It is an arithmetic number, because the mean of its divisors is an integer number (14716800).

Almost surely, 2^1276697856 is an apocalyptic number.

1276697856 is a gapful number since it is divisible by the number (16) 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 1276697856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119219200).

1276697856 is an abundant number, since it is smaller than the sum of its proper divisors (2961740544).

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

1276697856 is a wasteful number, since it uses less digits than its factorization.

1276697856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 491 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 57.

The square root of 1276697856 is about 35730.9089724849. The cubic root of 1276697856 is about 1084.8325553008.

The spelling of 1276697856 in words is "one billion, two hundred seventy-six million, six hundred ninety-seven thousand, eight hundred fifty-six".