642900 has 36 divisors (see below), whose sum is σ = 1860992. Its totient is φ = 171360.

The previous prime is 642899. The next prime is 642907. The reversal of 642900 is 9246.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772 + ... + 1371.

2⁶⁴²⁹⁰⁰ is an apocalyptic number.

642900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642900 is an abundant number, since it is smaller than the sum of its proper divisors (1218092).

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

642900 is a wasteful number, since it uses less digits than its factorization.

642900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 642900 is about 801.8104514160. The cubic root of 642900 is about 86.3073552557.

The spelling of 642900 in words is "six hundred forty-two thousand, nine hundred".