642570 has 16 divisors (see below), whose sum is σ = 1542240. Its totient is φ = 171344.

The previous prime is 642563. The next prime is 642581. The reversal of 642570 is 75246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642570.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642570.

It is an unprimeable number.

642570 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10680 + ... + 10739.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

2⁶⁴²⁵⁷⁰ is an apocalyptic number.

642570 is an abundant number, since it is smaller than the sum of its proper divisors (899670).

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

642570 is a wasteful number, since it uses less digits than its factorization.

642570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21429.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 642570 is about 801.6046407051. The cubic root of 642570 is about 86.2925855654.

It can be divided in two parts, 642 and 570, that multiplied together give a triangular number (365940 = T₈₅₅).

The spelling of 642570 in words is "six hundred forty-two thousand, five hundred seventy".