1276530640 has 120 divisors (see below), whose sum is σ = 3728511360. Its totient is φ = 397858560.

The previous prime is 1276530601. The next prime is 1276530643. The reversal of 1276530640 is 460356721.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1276530596 and 1276530605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276530643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58341 + ... + 77179.

It is an arithmetic number, because the mean of its divisors is an integer number (31070928).

Almost surely, 2^1276530640 is an apocalyptic number.

1276530640 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 1276530640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1864255680).

1276530640 is an abundant number, since it is smaller than the sum of its proper divisors (2451980720).

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

1276530640 is a wasteful number, since it uses less digits than its factorization.

1276530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18881 (or 18864 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 1276530640 is about 35728.5689609869. The cubic root of 1276530640 is about 1084.7851911104.

The spelling of 1276530640 in words is "one billion, two hundred seventy-six million, five hundred thirty thousand, six hundred forty".