642210210 has 24 divisors (see below), whose sum is σ = 1669746780. Its totient is φ = 171256032.

The previous prime is 642210193. The next prime is 642210223. The reversal of 642210210 is 12012246.

642210210 is a `hidden beast` number, since 642 + 2 + 1 + 0 + 21 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 605012409 + 37197801 = 24597^2 + 6099^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3567745 + ... + 3567924.

Almost surely, 2^642210210 is an apocalyptic number.

642210210 is an abundant number, since it is smaller than the sum of its proper divisors (1027536570).

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

642210210 is a wasteful number, since it uses less digits than its factorization.

642210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135682 (or 7135679 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 642210210 is about 25341.8667426060. The cubic root of 642210210 is about 862.7647681152.

Adding to 642210210 its reverse (12012246), we get a palindrome (654222456).

The spelling of 642210210 in words is "six hundred forty-two million, two hundred ten thousand, two hundred ten".