642087 has 10 divisors (see below), whose sum is σ = 959288. Its totient is φ = 428004.

The previous prime is 642079. The next prime is 642113. The reversal of 642087 is 780246.

642087 is nontrivially palindromic in base 15.

642087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642087 - 2³ = 642079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 642087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642077) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3883 + ... + 4044.

2⁶⁴²⁰⁸⁷ is an apocalyptic number.

642087 is a deficient number, since it is larger than the sum of its proper divisors (317201).

642087 is an equidigital number, since it uses as much as digits as its factorization.

642087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939 (or 7930 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 642087 is about 801.3033133589. The cubic root of 642087 is about 86.2709589897.

The spelling of 642087 in words is "six hundred forty-two thousand, eighty-seven".