642515 has 8 divisors (see below), whose sum is σ = 816480.
Its totient is φ = 483712.
The previous prime is 642487. The next prime is 642517. The reversal of 642515 is 515246.
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 642515 - 210 = 641491 is a prime.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642515.
It is not an unprimeable number, because it can be changed into a prime (642517) 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, 3695 + ... + 3864.
It is an arithmetic number, because the mean of its divisors is an integer number (102060).
2642515 is an apocalyptic number.
642515 is a deficient number, since it is larger than the sum of its proper divisors (173965).
642515 is a wasteful number, since it uses less digits than its factorization.
642515 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7581.
The product of its digits is 1200, while the sum is 23.
The square root of 642515 is about 801.5703337824.
The cubic root of 642515 is about 86.2901234587.
The spelling of 642515 in words is "six hundred forty-two thousand, five hundred fifteen".