643220362 has 8 divisors (see below), whose sum is σ = 967564836. Its totient is φ = 320698752.

The previous prime is 643220351. The next prime is 643220363. The reversal of 643220362 is 263022346.

It can be written as a sum of positive squares in 2 ways, for example, as 582208641 + 61011721 = 24129^2 + 7811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×643220362² = 827464868182822088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643220362.

It is not an unprimeable number, because it can be changed into a prime (643220363) 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, 454833 + ... + 456244.

Almost surely, 2^643220362 is an apocalyptic number.

643220362 is a deficient number, since it is larger than the sum of its proper divisors (324344474).

643220362 is a wasteful number, since it uses less digits than its factorization.

643220362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911432.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 643220362 is about 25361.7894084783. The cubic root of 643220362 is about 863.2168874746.

The spelling of 643220362 in words is "six hundred forty-three million, two hundred twenty thousand, three hundred sixty-two".