1279428480 has 512 divisors, whose sum is σ = 5076172800. Its totient is φ = 301916160.

The previous prime is 1279428473. The next prime is 1279428481. The reversal of 1279428480 is 848249721.

1279428480 is a `hidden beast` number, since 127 + 9 + 42 + 8 + 480 = 666.

It is a super-2 number, since 2×1279428480² = 3273874470870220800, which contains 22 as substring.

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 (1279428481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10074177 + ... + 10074303.

It is an arithmetic number, because the mean of its divisors is an integer number (9914400).

Almost surely, 2^1279428480 is an apocalyptic number.

1279428480 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 1279428480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2538086400).

1279428480 is an abundant number, since it is smaller than the sum of its proper divisors (3796744320).

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

1279428480 is a wasteful number, since it uses less digits than its factorization.

1279428480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1279428480 is about 35769.0995134068. The cubic root of 1279428480 is about 1085.6054242520.

The spelling of 1279428480 in words is "one billion, two hundred seventy-nine million, four hundred twenty-eight thousand, four hundred eighty".