643517422 has 16 divisors (see below), whose sum is σ = 1075850640. Its totient is φ = 286892928.

The previous prime is 643517419. The next prime is 643517423. The reversal of 643517422 is 224715346.

It is a super-2 number, since 2×643517422² = 828229344835052168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643517423) 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, 497433 + ... + 498724.

It is an arithmetic number, because the mean of its divisors is an integer number (67240665).

Almost surely, 2^643517422 is an apocalyptic number.

643517422 is a deficient number, since it is larger than the sum of its proper divisors (432333218).

643517422 is a wasteful number, since it uses less digits than its factorization.

643517422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996195.

The product of its digits is 40320, while the sum is 34.

The square root of 643517422 is about 25367.6451804262. The cubic root of 643517422 is about 863.3497541967.

The spelling of 643517422 in words is "six hundred forty-three million, five hundred seventeen thousand, four hundred twenty-two".