642064 has 10 divisors (see below), whose sum is σ = 1244030. Its totient is φ = 321024.

The previous prime is 642049. The next prime is 642071. The reversal of 642064 is 460246.

It can be written as a sum of positive squares in only one way, i.e., 350464 + 291600 = 592^2 + 540^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20049 + ... + 20080.

It is an arithmetic number, because the mean of its divisors is an integer number (124403).

2⁶⁴²⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

642064 is a deficient number, since it is larger than the sum of its proper divisors (601966).

642064 is a wasteful number, since it uses less digits than its factorization.

642064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40137 (or 40131 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 642064 is about 801.2889616112. The cubic root of 642064 is about 86.2699288823.

The spelling of 642064 in words is "six hundred forty-two thousand, sixty-four".