642378 has 16 divisors (see below), whose sum is σ = 1401696. Its totient is φ = 194640.

The previous prime is 642373. The next prime is 642403. The reversal of 642378 is 873246.

642378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (642373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801 + ... + 4932.

It is an arithmetic number, because the mean of its divisors is an integer number (87606).

2⁶⁴²³⁷⁸ is an apocalyptic number.

642378 is an abundant number, since it is smaller than the sum of its proper divisors (759318).

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

642378 is a wasteful number, since it uses less digits than its factorization.

642378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9749.

The product of its digits is 8064, while the sum is 30.

The square root of 642378 is about 801.4848719720. The cubic root of 642378 is about 86.2839899639.

It can be divided in two parts, 64 and 2378, that added together give a palindrome (2442).

The spelling of 642378 in words is "six hundred forty-two thousand, three hundred seventy-eight".