642734 has 4 divisors (see below), whose sum is σ = 964104. Its totient is φ = 321366.

The previous prime is 642701. The next prime is 642737. The reversal of 642734 is 437246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 437246 = 2 ⋅218623.

It is a d-powerful number, because it can be written as 6² + 4⁷ + 7⁵ + 2¹⁹ + 3⁹ + 4⁸ .

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642734.

It is not an unprimeable number, because it can be changed into a prime (642737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160682 + ... + 160685.

It is an arithmetic number, because the mean of its divisors is an integer number (241026).

2⁶⁴²⁷³⁴ is an apocalyptic number.

642734 is a deficient number, since it is larger than the sum of its proper divisors (321370).

642734 is a wasteful number, since it uses less digits than its factorization.

642734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321369.

The product of its digits is 4032, while the sum is 26.

The square root of 642734 is about 801.7069289959. The cubic root of 642734 is about 86.2999262858.

The spelling of 642734 in words is "six hundred forty-two thousand, seven hundred thirty-four".