642100 has 18 divisors (see below), whose sum is σ = 1393574. Its totient is φ = 256800.

The previous prime is 642079. The next prime is 642113. The reversal of 642100 is 1246.

It can be written as a sum of positive squares in 3 ways, for example, as 11664 + 630436 = 108^2 + 794^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3111 + ... + 3310.

2⁶⁴²¹⁰⁰ is an apocalyptic number.

It is an amenable number.

642100 is an abundant number, since it is smaller than the sum of its proper divisors (751474).

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

642100 is a wasteful number, since it uses less digits than its factorization.

642100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435 (or 6428 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 642100 is about 801.3114251026. The cubic root of 642100 is about 86.2715412134.

Adding to 642100 its reverse (1246), we get a palindrome (643346).

The spelling of 642100 in words is "six hundred forty-two thousand, one hundred".