642534 has 8 divisors (see below), whose sum is σ = 1285080. Its totient is φ = 214176.

The previous prime is 642533. The next prime is 642547. The reversal of 642534 is 435246.

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

642534 is an admirable number.

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 642534.

It is not an unprimeable number, because it can be changed into a prime (642533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53539 + ... + 53550.

It is an arithmetic number, because the mean of its divisors is an integer number (160635).

2⁶⁴²⁵³⁴ is an apocalyptic number.

642534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642534 is a wasteful number, since it uses less digits than its factorization.

642534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107094.

The product of its digits is 2880, while the sum is 24.

The square root of 642534 is about 801.5821854308. The cubic root of 642534 is about 86.2909740205.

It can be divided in two parts, 642 and 534, that added together give a triangular number (1176 = T₄₈).

The spelling of 642534 in words is "six hundred forty-two thousand, five hundred thirty-four".