645587 has 4 divisors (see below), whose sum is σ = 673680. Its totient is φ = 617496.

The previous prime is 645583. The next prime is 645599. The reversal of 645587 is 785546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645587 - 2² = 645583 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645587.

It is not an unprimeable number, because it can be changed into a prime (645581) 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, 14012 + ... + 14057.

It is an arithmetic number, because the mean of its divisors is an integer number (168420).

2⁶⁴⁵⁵⁸⁷ is an apocalyptic number.

645587 is a deficient number, since it is larger than the sum of its proper divisors (28093).

645587 is a wasteful number, since it uses less digits than its factorization.

645587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28092.

The product of its digits is 33600, while the sum is 35.

The square root of 645587 is about 803.4842873386. The cubic root of 645587 is about 86.4274286344.

The spelling of 645587 in words is "six hundred forty-five thousand, five hundred eighty-seven".