1278204804 has 18 divisors (see below), whose sum is σ = 3231017790. Its totient is φ = 426068256.

The previous prime is 1278204787. The next prime is 1278204821. The reversal of 1278204804 is 4084028721.

It is an interprime number because it is at equal distance from previous prime (1278204787) and next prime (1278204821).

It can be written as a sum of positive squares in only one way, i.e., 806446404 + 471758400 = 28398^2 + 21720^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 35505689 = 1278204804 / (1 + 2 + 7 + 8 + 2 + 0 + 4 + 8 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17752809 + ... + 17752880.

Almost surely, 2^1278204804 is an apocalyptic number.

It is an amenable number.

1278204804 is an abundant number, since it is smaller than the sum of its proper divisors (1952812986).

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

1278204804 is a wasteful number, since it uses less digits than its factorization.

1278204804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35505699 (or 35505694 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 1278204804 is about 35751.9902103365. The cubic root of 1278204804 is about 1085.2592141895.

The spelling of 1278204804 in words is "one billion, two hundred seventy-eight million, two hundred four thousand, eight hundred four".