1278448776 has 96 divisors (see below), whose sum is σ = 3786868800. Its totient is φ = 386421120.

The previous prime is 1278448729. The next prime is 1278448783. The reversal of 1278448776 is 6778448721.

1278448776 is a `hidden beast` number, since 12 + 7 + 84 + 487 + 76 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345850 + ... + 349526.

It is an arithmetic number, because the mean of its divisors is an integer number (39446550).

Almost surely, 2^1278448776 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 1278448776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1893434400).

1278448776 is an abundant number, since it is smaller than the sum of its proper divisors (2508420024).

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

1278448776 is a wasteful number, since it uses less digits than its factorization.

1278448776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139 (or 4132 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 54.

The square root of 1278448776 is about 35755.4020533961. The cubic root of 1278448776 is about 1085.3282579025.

Subtracting 1278448776 from its reverse (6778448721), we obtain a palindrome (5499999945).

It can be divided in two parts, 1278 and 448776, that added together give a palindrome (450054).

The spelling of 1278448776 in words is "one billion, two hundred seventy-eight million, four hundred forty-eight thousand, seven hundred seventy-six".