1276798464 has 200 divisors, whose sum is σ = 4037306328. Its totient is φ = 400343040.

The previous prime is 1276798463. The next prime is 1276798477. The reversal of 1276798464 is 4648976721.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1276798464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276798463) 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, 704119 + ... + 705929.

Almost surely, 2^1276798464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276798464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018653164).

1276798464 is an abundant number, since it is smaller than the sum of its proper divisors (2760507864).

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

1276798464 is an equidigital number, since it uses as much as digits as its factorization.

1276798464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1833 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 1276798464 is about 35732.3168014614. The cubic root of 1276798464 is about 1084.8610506795.

The spelling of 1276798464 in words is "one billion, two hundred seventy-six million, seven hundred ninety-eight thousand, four hundred sixty-four".