863987802890 has 32 divisors (see below), whose sum is σ = 1561461841296. Its totient is φ = 344199905280.

The previous prime is 863987802889. The next prime is 863987802901. The reversal of 863987802890 is 98208789368.

It can be written as a sum of positive squares in 8 ways, for example, as 146268767401 + 717719035489 = 382451^2 + 847183^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 863987802890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5864774 + ... + 6010286.

Almost surely, 2^863987802890 is an apocalyptic number.

863987802890 is a deficient number, since it is larger than the sum of its proper divisors (697474038406).

863987802890 is a wasteful number, since it uses less digits than its factorization.

863987802890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147914.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 863987802890 in words is "eight hundred sixty-three billion, nine hundred eighty-seven million, eight hundred two thousand, eight hundred ninety".