3478521816 has 192 divisors, whose sum is σ = 11827296000. Its totient is φ = 897235200.

The previous prime is 3478521799. The next prime is 3478521821. The reversal of 3478521816 is 6181258743.

3478521816 is a `hidden beast` number, since 3 + 47 + 8 + 521 + 81 + 6 = 666.

It is a super-2 number, since 2×3478521816² = 24200228048775875712, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 823951 + ... + 828161.

It is an arithmetic number, because the mean of its divisors is an integer number (61600500).

Almost surely, 2^3478521816 is an apocalyptic number.

3478521816 is a gapful number since it is divisible by the number (36) 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 3478521816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5913648000).

3478521816 is an abundant number, since it is smaller than the sum of its proper divisors (8348774184).

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

3478521816 is a wasteful number, since it uses less digits than its factorization.

3478521816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4390 (or 4383 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 3478521816 is about 58978.9947015037. The cubic root of 3478521816 is about 1515.1823771556.

The spelling of 3478521816 in words is "three billion, four hundred seventy-eight million, five hundred twenty-one thousand, eight hundred sixteen".