1276376864 has 96 divisors (see below), whose sum is σ = 3123308160. Its totient is φ = 500871168.

The previous prime is 1276376861. The next prime is 1276376887. The reversal of 1276376864 is 4686736721.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1276376861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136367 + ... + 145425.

It is an arithmetic number, because the mean of its divisors is an integer number (32534460).

Almost surely, 2^1276376864 is an apocalyptic number.

1276376864 is a gapful number since it is divisible by the number (14) 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 1276376864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1561654080).

1276376864 is an abundant number, since it is smaller than the sum of its proper divisors (1846931296).

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

1276376864 is a wasteful number, since it uses less digits than its factorization.

1276376864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130 (or 9122 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 50.

The square root of 1276376864 is about 35726.4168928260. The cubic root of 1276376864 is about 1084.7416301698.

The spelling of 1276376864 in words is "one billion, two hundred seventy-six million, three hundred seventy-six thousand, eight hundred sixty-four".