1278448755 has 16 divisors (see below), whose sum is σ = 2046021120. Its totient is φ = 681671648.

The previous prime is 1278448729. The next prime is 1278448783. The reversal of 1278448755 is 5578448721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1278448755 - 2¹⁴ = 1278432371 is a prime.

It is a super-2 number, since 2×1278448755² = 3268862438322100050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1278448698 and 1278448707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75064 + ... + 90506.

It is an arithmetic number, because the mean of its divisors is an integer number (127876320).

Almost surely, 2^1278448755 is an apocalyptic number.

1278448755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278448755 is a deficient number, since it is larger than the sum of its proper divisors (767572365).

1278448755 is a wasteful number, since it uses less digits than its factorization.

1278448755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20970.

The product of its digits is 2508800, while the sum is 51.

The square root of 1278448755 is about 35755.4017597342. The cubic root of 1278448755 is about 1085.3282519599.

The spelling of 1278448755 in words is "one billion, two hundred seventy-eight million, four hundred forty-eight thousand, seven hundred fifty-five".