1278801955 has 48 divisors (see below), whose sum is σ = 1679438880. Its totient is φ = 933825024.

The previous prime is 1278801949. The next prime is 1278802027. The reversal of 1278801955 is 5591088721.

It is not a de Polignac number, because 1278801955 - 2³ = 1278801947 is a prime.

It is a super-2 number, since 2×1278801955² = 3270668880223644050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7144056 + ... + 7144234.

It is an arithmetic number, because the mean of its divisors is an integer number (34988310).

Almost surely, 2^1278801955 is an apocalyptic number.

1278801955 is a deficient number, since it is larger than the sum of its proper divisors (400636925).

1278801955 is a wasteful number, since it uses less digits than its factorization.

1278801955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 1278801955 is about 35760.3405324949. The cubic root of 1278801955 is about 1085.4281914740.

The spelling of 1278801955 in words is "one billion, two hundred seventy-eight million, eight hundred one thousand, nine hundred fifty-five".