642770 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 228096.

The previous prime is 642769. The next prime is 642779. The reversal of 642770 is 77246.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642770.

It is not an unprimeable number, because it can be changed into a prime (642779) 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 15 ways as a sum of consecutive naturals, for example, 3131 + ... + 3329.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2⁶⁴²⁷⁷⁰ is an apocalyptic number.

642770 is an abundant number, since it is smaller than the sum of its proper divisors (653230).

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

642770 is a wasteful number, since it uses less digits than its factorization.

642770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 642770 is about 801.7293807763. The cubic root of 642770 is about 86.3015374963.

The spelling of 642770 in words is "six hundred forty-two thousand, seven hundred seventy".