1276640000 has 180 divisors, whose sum is σ = 3256582560. Its totient is φ = 499200000.

The previous prime is 1276639997. The next prime is 1276640003. The reversal of 1276640000 is 466721.

It is an interprime number because it is at equal distance from previous prime (1276639997) and next prime (1276640003).

It is not an unprimeable number, because it can be changed into a prime (1276640003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12639950 + ... + 12640050.

Almost surely, 2^1276640000 is an apocalyptic number.

1276640000 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 1276640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1628291280).

1276640000 is an abundant number, since it is smaller than the sum of its proper divisors (1979942560).

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

1276640000 is an frugal number, since it uses more digits than its factorization.

1276640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1276640000 is about 35730.0993561451. The cubic root of 1276640000 is about 1084.8161679673.

The spelling of 1276640000 in words is "one billion, two hundred seventy-six million, six hundred forty thousand".