1613081808 has 120 divisors (see below), whose sum is σ = 4878953352. Its totient is φ = 494567424.

The previous prime is 1613081797. The next prime is 1613081851. The reversal of 1613081808 is 8081803161.

It can be written as a sum of positive squares in 4 ways, for example, as 17239104 + 1595842704 = 4152^2 + 39948^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 584560 + ... + 587312.

Almost surely, 2^1613081808 is an apocalyptic number.

1613081808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1613081808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439476676).

1613081808 is an abundant number, since it is smaller than the sum of its proper divisors (3265871544).

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

1613081808 is a wasteful number, since it uses less digits than its factorization.

1613081808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1613081808 is about 40163.1897139657. The cubic root of 1613081808 is about 1172.7860669542.

Adding to 1613081808 its reverse (8081803161), we get a palindrome (9694884969).

The spelling of 1613081808 in words is "one billion, six hundred thirteen million, eighty-one thousand, eight hundred eight".