350643816 has 80 divisors (see below), whose sum is σ = 987940800. Its totient is φ = 116189856.

The previous prime is 350643779. The next prime is 350643817. The reversal of 350643816 is 618346053.

350643816 is a `hidden beast` number, since 3 + 5 + 0 + 643 + 8 + 1 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (350643817) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 114481 + ... + 117503.

It is an arithmetic number, because the mean of its divisors is an integer number (12349260).

Almost surely, 2^350643816 is an apocalyptic number.

350643816 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 350643816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493970400).

350643816 is an abundant number, since it is smaller than the sum of its proper divisors (637296984).

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

350643816 is a wasteful number, since it uses less digits than its factorization.

350643816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 350643816 is about 18725.4857346879. The cubic root of 350643816 is about 705.1617193514.

Adding to 350643816 its reverse (618346053), we get a palindrome (968989869).

The spelling of 350643816 in words is "three hundred fifty million, six hundred forty-three thousand, eight hundred sixteen".