6813135990 has 80 divisors (see below), whose sum is σ = 18570882528. Its totient is φ = 1791932544.

The previous prime is 6813135983. The next prime is 6813136003. The reversal of 6813135990 is 995313186.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1519 + ... + 116741.

Almost surely, 2^6813135990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6813135990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9285441264).

6813135990 is an abundant number, since it is smaller than the sum of its proper divisors (11757746538).

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

6813135990 is a wasteful number, since it uses less digits than its factorization.

6813135990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115315 (or 115306 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 6813135990 is about 82541.7227225117. The cubic root of 6813135990 is about 1895.7556216436.

The spelling of 6813135990 in words is "six billion, eight hundred thirteen million, one hundred thirty-five thousand, nine hundred ninety".