3406778816 has 56 divisors (see below), whose sum is σ = 7736250720. Its totient is φ = 1458127872.

The previous prime is 3406778789. The next prime is 3406778827. The reversal of 3406778816 is 6188776043.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×3406778816² = 23212283802292723712, which contains 22 as substring.

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, 366806 + ... + 375978.

Almost surely, 2^3406778816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3406778816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3868125360).

3406778816 is an abundant number, since it is smaller than the sum of its proper divisors (4329471904).

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

3406778816 is an equidigital number, since it uses as much as digits as its factorization.

3406778816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10021 (or 10011 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 3406778816 is about 58367.6178715561. The cubic root of 3406778816 is about 1504.6932728853.

The spelling of 3406778816 in words is "three billion, four hundred six million, seven hundred seventy-eight thousand, eight hundred sixteen".