3808821816 has 24 divisors (see below), whose sum is σ = 10315559280. Its totient is φ = 1269607248.

The previous prime is 3808821697. The next prime is 3808821869. The reversal of 3808821816 is 6181288083.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26450080 + ... + 26450223.

It is an arithmetic number, because the mean of its divisors is an integer number (429814970).

Almost surely, 2^3808821816 is an apocalyptic number.

3808821816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3808821816 is an abundant number, since it is smaller than the sum of its proper divisors (6506737464).

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

3808821816 is a wasteful number, since it uses less digits than its factorization.

3808821816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52900315 (or 52900308 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 3808821816 is about 61715.6529253317. The cubic root of 3808821816 is about 1561.6973930746.

The spelling of 3808821816 in words is "three billion, eight hundred eight million, eight hundred twenty-one thousand, eight hundred sixteen".