1278723776 has 56 divisors (see below), whose sum is σ = 2775539280. Its totient is φ = 579686400.

The previous prime is 1278723763. The next prime is 1278723779. The reversal of 1278723776 is 6773278721.

It is not an unprimeable number, because it can be changed into a prime (1278723779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285716 + ... + 290156.

Almost surely, 2^1278723776 is an apocalyptic number.

1278723776 is a gapful number since it is divisible by the number (16) 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 1278723776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1387769640).

1278723776 is an abundant number, since it is smaller than the sum of its proper divisors (1496815504).

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

1278723776 is a wasteful number, since it uses less digits than its factorization.

1278723776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873 (or 4863 counting only the distinct ones).

The product of its digits is 1382976, while the sum is 50.

The square root of 1278723776 is about 35759.2474193739. The cubic root of 1278723776 is about 1085.4060719635.

Subtracting 1278723776 from its reverse (6773278721), we obtain a palindrome (5494554945).

It can be divided in two parts, 12787 and 23776, that added together give a palindrome (36563).

The spelling of 1278723776 in words is "one billion, two hundred seventy-eight million, seven hundred twenty-three thousand, seven hundred seventy-six".