642975 has 12 divisors (see below), whose sum is σ = 1063176. Its totient is φ = 342880.

The previous prime is 642973. The next prime is 642977. The reversal of 642975 is 579246.

It is an interprime number because it is at equal distance from previous prime (642973) and next prime (642977).

It is not a de Polignac number, because 642975 - 2¹ = 642973 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4⁷ + 9⁶ + 2 + 7⁵ + 5⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4212 + ... + 4361.

It is an arithmetic number, because the mean of its divisors is an integer number (88598).

2⁶⁴²⁹⁷⁵ is an apocalyptic number.

642975 is a deficient number, since it is larger than the sum of its proper divisors (420201).

642975 is a wasteful number, since it uses less digits than its factorization.

642975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8586 (or 8581 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 642975 is about 801.8572192105. The cubic root of 642975 is about 86.3107112986.

Adding to 642975 its reverse (579246), we get a palindrome (1222221).

The spelling of 642975 in words is "six hundred forty-two thousand, nine hundred seventy-five".