642680 has 16 divisors (see below), whose sum is σ = 1446120. Its totient is φ = 257056.

The previous prime is 642673. The next prime is 642683. The reversal of 642680 is 86246.

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 (642683) 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 3 ways as a sum of consecutive naturals, for example, 7994 + ... + 8073.

2⁶⁴²⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

642680 is an abundant number, since it is smaller than the sum of its proper divisors (803440).

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

642680 is a wasteful number, since it uses less digits than its factorization.

642680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16078 (or 16074 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 642680 is about 801.6732501462. The cubic root of 642680 is about 86.2975093572.

It can be divided in two parts, 64 and 2680, that added together give a cube (2744 = 14³).

The spelling of 642680 in words is "six hundred forty-two thousand, six hundred eighty".