6539990804 has 24 divisors (see below), whose sum is σ = 11661790056. Its totient is φ = 3208320000.

The previous prime is 6539990803. The next prime is 6539990813. The reversal of 6539990804 is 4080999356.

It can be written as a sum of positive squares in 4 ways, for example, as 741472900 + 5798517904 = 27230^2 + 76148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539990803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64424 + ... + 131264.

It is an arithmetic number, because the mean of its divisors is an integer number (485907919).

Almost surely, 2^6539990804 is an apocalyptic number.

It is an amenable number.

6539990804 is a deficient number, since it is larger than the sum of its proper divisors (5121799252).

6539990804 is a wasteful number, since it uses less digits than its factorization.

6539990804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67307 (or 67305 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 6539990804 is about 80870.2096201067. The cubic root of 6539990804 is about 1870.0750924500.

The spelling of 6539990804 in words is "six billion, five hundred thirty-nine million, nine hundred ninety thousand, eight hundred four".