1808820816 has 40 divisors (see below), whose sum is σ = 5097587424. Its totient is φ = 548127360.

The previous prime is 1808820787. The next prime is 1808820823. The reversal of 1808820816 is 6180288081.

It is a congruent number.

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, 1712371 + ... + 1713426.

Almost surely, 2^1808820816 is an apocalyptic number.

1808820816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1808820816 is an abundant number, since it is smaller than the sum of its proper divisors (3288766608).

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

1808820816 is a wasteful number, since it uses less digits than its factorization.

1808820816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425819 (or 3425813 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 42.

The square root of 1808820816 is about 42530.2341399621. The cubic root of 1808820816 is about 1218.4241985989.

The spelling of 1808820816 in words is "one billion, eight hundred eight million, eight hundred twenty thousand, eight hundred sixteen".