351216820 has 12 divisors (see below), whose sum is σ = 737555364. Its totient is φ = 140486720.

The previous prime is 351216773. The next prime is 351216823. The reversal of 351216820 is 28612153.

It can be written as a sum of positive squares in 2 ways, for example, as 188348176 + 162868644 = 13724^2 + 12762^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351216823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8780401 + ... + 8780440.

It is an arithmetic number, because the mean of its divisors is an integer number (61462947).

Almost surely, 2^351216820 is an apocalyptic number.

It is an amenable number.

351216820 is an abundant number, since it is smaller than the sum of its proper divisors (386338544).

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

351216820 is a wasteful number, since it uses less digits than its factorization.

351216820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17560850 (or 17560848 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 351216820 is about 18740.7795995791. The cubic root of 351216820 is about 705.5456232531.

Adding to 351216820 its reverse (28612153), we get a palindrome (379828973).

The spelling of 351216820 in words is "three hundred fifty-one million, two hundred sixteen thousand, eight hundred twenty".