1279226880 has 528 divisors, whose sum is σ = 4966251264. Its totient is φ = 302776320.

The previous prime is 1279226833. The next prime is 1279226881. The reversal of 1279226880 is 886229721.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279226881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18017245 + ... + 18017315.

Almost surely, 2^1279226880 is an apocalyptic number.

1279226880 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 1279226880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483125632).

1279226880 is an abundant number, since it is smaller than the sum of its proper divisors (3687024384).

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

1279226880 is a wasteful number, since it uses less digits than its factorization.

1279226880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1279226880 is about 35766.2813275297. The cubic root of 1279226880 is about 1085.5484015128.

The spelling of 1279226880 in words is "one billion, two hundred seventy-nine million, two hundred twenty-six thousand, eight hundred eighty".