350721220 has 24 divisors (see below), whose sum is σ = 779839704. Its totient is φ = 132036096.

The previous prime is 350721199. The next prime is 350721223. The reversal of 350721220 is 22127053.

It can be written as a sum of positive squares in 4 ways, for example, as 10982596 + 339738624 = 3314^2 + 18432^2 .

It is a junction number, because it is equal to n+sod(n) for n = 350721191 and 350721200.

It is not an unprimeable number, because it can be changed into a prime (350721223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515427 + ... + 516106.

It is an arithmetic number, because the mean of its divisors is an integer number (32493321).

Almost surely, 2^350721220 is an apocalyptic number.

It is an amenable number.

350721220 is an abundant number, since it is smaller than the sum of its proper divisors (429118484).

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

350721220 is a wasteful number, since it uses less digits than its factorization.

350721220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031559 (or 1031557 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 350721220 is about 18727.5524295088. The cubic root of 350721220 is about 705.2136032664.

Adding to 350721220 its reverse (22127053), we get a palindrome (372848273).

The spelling of 350721220 in words is "three hundred fifty million, seven hundred twenty-one thousand, two hundred twenty".