642662 has 4 divisors (see below), whose sum is σ = 963996. Its totient is φ = 321330.

The previous prime is 642623. The next prime is 642673. The reversal of 642662 is 266246.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 160664 + ... + 160667.

It is an arithmetic number, because the mean of its divisors is an integer number (240999).

2⁶⁴²⁶⁶² is an apocalyptic number.

642662 is a deficient number, since it is larger than the sum of its proper divisors (321334).

642662 is a wasteful number, since it uses less digits than its factorization.

642662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321333.

The product of its digits is 3456, while the sum is 26.

The square root of 642662 is about 801.6620235486. The cubic root of 642662 is about 86.2967036843.

The spelling of 642662 in words is "six hundred forty-two thousand, six hundred sixty-two".