643220190 has 80 divisors (see below), whose sum is σ = 1762298208. Its totient is φ = 168277824.

The previous prime is 643220159. The next prime is 643220233. The reversal of 643220190 is 91022346.

643220190 is a `hidden beast` number, since 643 + 2 + 2 + 0 + 19 + 0 = 666.

It is a super-2 number, since 2×643220190² = 827464425647272200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35439 + ... + 50421.

Almost surely, 2^643220190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643220190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881149104).

643220190 is an abundant number, since it is smaller than the sum of its proper divisors (1119078018).

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

643220190 is a wasteful number, since it uses less digits than its factorization.

643220190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15055 (or 15046 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 643220190 is about 25361.7860175501. The cubic root of 643220190 is about 863.2168105319.

The spelling of 643220190 in words is "six hundred forty-three million, two hundred twenty thousand, one hundred ninety".