1278355485 has 64 divisors (see below), whose sum is σ = 2284277760. Its totient is φ = 605280000.

The previous prime is 1278355453. The next prime is 1278355493. The reversal of 1278355485 is 5845538721.

It is not a de Polignac number, because 1278355485 - 2⁵ = 1278355453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1316050 + ... + 1317020.

It is an arithmetic number, because the mean of its divisors is an integer number (35691840).

Almost surely, 2^1278355485 is an apocalyptic number.

1278355485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278355485 is a deficient number, since it is larger than the sum of its proper divisors (1005922275).

1278355485 is a wasteful number, since it uses less digits than its factorization.

1278355485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 1344000, while the sum is 48.

The square root of 1278355485 is about 35754.0974574943. The cubic root of 1278355485 is about 1085.3018577256.

The spelling of 1278355485 in words is "one billion, two hundred seventy-eight million, three hundred fifty-five thousand, four hundred eighty-five".