1278578160 has 120 divisors (see below), whose sum is σ = 4546517040. Its totient is φ = 320894976.

The previous prime is 1278578149. The next prime is 1278578173. The reversal of 1278578160 is 618758721.

It is a happy number.

1278578160 is a `hidden beast` number, since 1 + 2 + 78 + 578 + 1 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1278578160² = 3269524222457971200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39990 + ... + 64469.

It is an arithmetic number, because the mean of its divisors is an integer number (37887642).

Almost surely, 2^1278578160 is an apocalyptic number.

1278578160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278578160 is an abundant number, since it is smaller than the sum of its proper divisors (3267938880).

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

1278578160 is a wasteful number, since it uses less digits than its factorization.

1278578160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104495 (or 104486 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 1278578160 is about 35757.2113006593. The cubic root of 1278578160 is about 1085.3648698177.

The spelling of 1278578160 in words is "one billion, two hundred seventy-eight million, five hundred seventy-eight thousand, one hundred sixty".