1278948720 has 160 divisors (see below), whose sum is σ = 4687557120. Its totient is φ = 282240000.

The previous prime is 1278948719. The next prime is 1278948721. The reversal of 1278948720 is 278498721.

It is an interprime number because it is at equal distance from previous prime (1278948719) and next prime (1278948721).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1278948720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278948721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35595 + ... + 61845.

It is an arithmetic number, because the mean of its divisors is an integer number (29297232).

Almost surely, 2^1278948720 is an apocalyptic number.

1278948720 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 1278948720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2343778560).

1278948720 is an abundant number, since it is smaller than the sum of its proper divisors (3408608400).

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

1278948720 is a wasteful number, since it uses less digits than its factorization.

1278948720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26303 (or 26297 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1278948720 is about 35762.3925374128. The cubic root of 1278948720 is about 1085.4697138729.

The spelling of 1278948720 in words is "one billion, two hundred seventy-eight million, nine hundred forty-eight thousand, seven hundred twenty".