1278720000 has 480 divisors, whose sum is σ = 4861256400. Its totient is φ = 331776000.

The previous prime is 1278719999. The next prime is 1278720017. The reversal of 1278720000 is 278721.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34559982 + ... + 34560018.

Almost surely, 2^1278720000 is an apocalyptic number.

1278720000 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 1278720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2430628200).

1278720000 is an abundant number, since it is smaller than the sum of its proper divisors (3582536400).

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

1278720000 is an frugal number, since it uses more digits than its factorization.

1278720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1278720000 is about 35759.1946218032. The cubic root of 1278720000 is about 1085.4050035812.

Adding to 1278720000 its reverse (278721), we get a palindrome (1278998721).

The spelling of 1278720000 in words is "one billion, two hundred seventy-eight million, seven hundred twenty thousand".