64642 has 4 divisors (see below), whose sum is σ = 96966. Its totient is φ = 32320.

The previous prime is 64633. The next prime is 64661. The reversal of 64642 is 24646.

64642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24646 = 2 ⋅12323.

It can be written as a sum of positive squares in only one way, i.e., 58081 + 6561 = 241^2 + 81^2 .

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16159 + ... + 16162.

2⁶⁴⁶⁴² is an apocalyptic number.

64642 is a deficient number, since it is larger than the sum of its proper divisors (32324).

64642 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 64642 = (44626)₁₁.

64642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32323.

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

The square root of 64642 is about 254.2479105126. The cubic root of 64642 is about 40.1333052492.

Subtracting from 64642 its sum of digits (22), we obtain a triangular number (64620 = T₃₅₉).

The spelling of 64642 in words is "sixty-four thousand, six hundred forty-two".