1028636804 has 24 divisors (see below), whose sum is σ = 1940626968. Its totient is φ = 474255360.

The previous prime is 1028636767. The next prime is 1028636821. The reversal of 1028636804 is 4086368201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2715904 + 1025920900 = 1648^2 + 32030^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41924 + ... + 61764.

It is an arithmetic number, because the mean of its divisors is an integer number (80859457).

Almost surely, 2^1028636804 is an apocalyptic number.

It is an amenable number.

1028636804 is a deficient number, since it is larger than the sum of its proper divisors (911990164).

1028636804 is a wasteful number, since it uses less digits than its factorization.

1028636804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20855 (or 20853 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 1028636804 is about 32072.3682318596. The cubic root of 1028636804 is about 1009.4559053567.

The spelling of 1028636804 in words is "one billion, twenty-eight million, six hundred thirty-six thousand, eight hundred four".