642206320 has 40 divisors (see below), whose sum is σ = 1706435424. Its totient is φ = 220184832.

The previous prime is 642206293. The next prime is 642206321. The reversal of 642206320 is 23602246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642206321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572839 + ... + 573958.

Almost surely, 2^642206320 is an apocalyptic number.

It is an amenable number.

642206320 is an abundant number, since it is smaller than the sum of its proper divisors (1064229104).

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

642206320 is a wasteful number, since it uses less digits than its factorization.

642206320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146817 (or 1146811 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 642206320 is about 25341.7899920270. The cubic root of 642206320 is about 862.7630261302.

Adding to 642206320 its reverse (23602246), we get a palindrome (665808566).

The spelling of 642206320 in words is "six hundred forty-two million, two hundred six thousand, three hundred twenty".