642958 has 8 divisors (see below), whose sum is σ = 971280. Its totient is φ = 319200.

The previous prime is 642953. The next prime is 642973. The reversal of 642958 is 859246.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642953) 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, 763 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (121410).

2⁶⁴²⁹⁵⁸ is an apocalyptic number.

642958 is a deficient number, since it is larger than the sum of its proper divisors (328322).

642958 is a wasteful number, since it uses less digits than its factorization.

642958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282.

The product of its digits is 17280, while the sum is 34.

The square root of 642958 is about 801.8466187495. The cubic root of 642958 is about 86.3099506184.

It can be divided in two parts, 642 and 958, that added together give a square (1600 = 40²).

The spelling of 642958 in words is "six hundred forty-two thousand, nine hundred fifty-eight".