1278378500 has 48 divisors (see below), whose sum is σ = 3190841472. Its totient is φ = 438300000.

The previous prime is 1278378481. The next prime is 1278378503. The reversal of 1278378500 is 58738721.

It is not an unprimeable number, because it can be changed into a prime (1278378503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179126 + ... + 186125.

It is an arithmetic number, because the mean of its divisors is an integer number (66475864).

Almost surely, 2^1278378500 is an apocalyptic number.

1278378500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278378500 is an abundant number, since it is smaller than the sum of its proper divisors (1912462972).

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

1278378500 is a wasteful number, since it uses less digits than its factorization.

1278378500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365277 (or 365265 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1278378500 is about 35754.4193072689. The cubic root of 1278378500 is about 1085.3083707998.

The spelling of 1278378500 in words is "one billion, two hundred seventy-eight million, three hundred seventy-eight thousand, five hundred".