1280856478 has 8 divisors (see below), whose sum is σ = 2095947000. Its totient is φ = 582207480.

The previous prime is 1280856439. The next prime is 1280856503. The reversal of 1280856478 is 8746580821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29110353 + ... + 29110396.

It is an arithmetic number, because the mean of its divisors is an integer number (261993375).

Almost surely, 2^1280856478 is an apocalyptic number.

1280856478 is a deficient number, since it is larger than the sum of its proper divisors (815090522).

1280856478 is a wasteful number, since it uses less digits than its factorization.

1280856478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58220762.

The product of its (nonzero) digits is 860160, while the sum is 49.

The square root of 1280856478 is about 35789.0552823066. The cubic root of 1280856478 is about 1086.0091633702.

It can be divided in two parts, 1280 and 856478, that added together give a palindrome (857758).

The spelling of 1280856478 in words is "one billion, two hundred eighty million, eight hundred fifty-six thousand, four hundred seventy-eight".