642694 has 16 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 280800.

The previous prime is 642683. The next prime is 642701. The reversal of 642694 is 496246.

642694 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (68355).

2⁶⁴²⁶⁹⁴ is an apocalyptic number.

642694 is a deficient number, since it is larger than the sum of its proper divisors (450986).

642694 is a wasteful number, since it uses less digits than its factorization.

642694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335.

The product of its digits is 10368, while the sum is 31.

The square root of 642694 is about 801.6819818357. The cubic root of 642694 is about 86.2981359813.

The spelling of 642694 in words is "six hundred forty-two thousand, six hundred ninety-four".