1276645056 has 112 divisors (see below), whose sum is σ = 3622487040. Its totient is φ = 395366400.

The previous prime is 1276645037. The next prime is 1276645087. The reversal of 1276645056 is 6505466721.

It is a junction number, because it is equal to n+sod(n) for n = 1276644999 and 1276645017.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255381 + ... + 260331.

Almost surely, 2^1276645056 is an apocalyptic number.

1276645056 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 1276645056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1811243520).

1276645056 is an abundant number, since it is smaller than the sum of its proper divisors (2345841984).

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

1276645056 is a wasteful number, since it uses less digits than its factorization.

1276645056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062 (or 5052 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 1276645056 is about 35730.1701087470. The cubic root of 1276645056 is about 1084.8176000660.

The spelling of 1276645056 in words is "one billion, two hundred seventy-six million, six hundred forty-five thousand, fifty-six".