642637 has 8 divisors (see below), whose sum is σ = 684000. Its totient is φ = 602064.

The previous prime is 642623. The next prime is 642673. The reversal of 642637 is 736246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642637 - 2¹¹ = 640589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642737) 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 7 ways as a sum of consecutive naturals, for example, 2718 + ... + 2944.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2⁶⁴²⁶³⁷ is an apocalyptic number.

It is an amenable number.

642637 is a deficient number, since it is larger than the sum of its proper divisors (41363).

642637 is a wasteful number, since it uses less digits than its factorization.

642637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 6048, while the sum is 28.

The square root of 642637 is about 801.6464307910. The cubic root of 642637 is about 86.2955846691.

It can be divided in two parts, 64 and 2637, that added together give a triangular number (2701 = T₇₃).

The spelling of 642637 in words is "six hundred forty-two thousand, six hundred thirty-seven".