1280404078 has 4 divisors (see below), whose sum is σ = 1920606120. Its totient is φ = 640202038.

The previous prime is 1280404063. The next prime is 1280404093. The reversal of 1280404078 is 8704040821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1280404063) and next prime (1280404093).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320101018 + ... + 320101021.

It is an arithmetic number, because the mean of its divisors is an integer number (480151530).

Almost surely, 2^1280404078 is an apocalyptic number.

1280404078 is a deficient number, since it is larger than the sum of its proper divisors (640202042).

1280404078 is an equidigital number, since it uses as much as digits as its factorization.

1280404078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640202041.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 1280404078 is about 35782.7343561109. The cubic root of 1280404078 is about 1085.8812884133.

Adding to 1280404078 its reverse (8704040821), we get a palindrome (9984444899).

The spelling of 1280404078 in words is "one billion, two hundred eighty million, four hundred four thousand, seventy-eight".