1280770400 has 288 divisors, whose sum is σ = 3917124288. Its totient is φ = 398131200.

The previous prime is 1280770399. The next prime is 1280770409. The reversal of 1280770400 is 40770821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280770409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5314280 + ... + 5314520.

It is an arithmetic number, because the mean of its divisors is an integer number (13601126).

Almost surely, 2^1280770400 is an apocalyptic number.

1280770400 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 1280770400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1958562144).

1280770400 is an abundant number, since it is smaller than the sum of its proper divisors (2636353888).

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

1280770400 is a wasteful number, since it uses less digits than its factorization.

1280770400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 1280770400 is about 35787.8526877487. The cubic root of 1280770400 is about 1085.9848349638.

The spelling of 1280770400 in words is "one billion, two hundred eighty million, seven hundred seventy thousand, four hundred".