642485 has 8 divisors (see below), whose sum is σ = 811680. Its totient is φ = 486864.

The previous prime is 642457. The next prime is 642487. The reversal of 642485 is 584246.

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

It is a cyclic number.

It is not a de Polignac number, because 642485 - 2¹⁶ = 576949 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642485.

It is not an unprimeable number, because it can be changed into a prime (642487) 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, 3287 + ... + 3476.

It is an arithmetic number, because the mean of its divisors is an integer number (101460).

2⁶⁴²⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

642485 is a deficient number, since it is larger than the sum of its proper divisors (169195).

642485 is a wasteful number, since it uses less digits than its factorization.

642485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6787.

The product of its digits is 7680, while the sum is 29.

The square root of 642485 is about 801.5516202965. The cubic root of 642485 is about 86.2887804322.

The spelling of 642485 in words is "six hundred forty-two thousand, four hundred eighty-five".