1278203904 has 144 divisors (see below), whose sum is σ = 3812477760. Its totient is φ = 412139520.

The previous prime is 1278203881. The next prime is 1278203911. The reversal of 1278203904 is 4093028721.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 570274 + ... + 572510.

It is an arithmetic number, because the mean of its divisors is an integer number (26475540).

Almost surely, 2^1278203904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278203904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906238880).

1278203904 is an abundant number, since it is smaller than the sum of its proper divisors (2534273856).

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

1278203904 is a wasteful number, since it uses less digits than its factorization.

1278203904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296 (or 2273 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1278203904 is about 35751.9776236224. The cubic root of 1278203904 is about 1085.2589594746.

The spelling of 1278203904 in words is "one billion, two hundred seventy-eight million, two hundred three thousand, nine hundred four".