648187 has 4 divisors (see below), whose sum is σ = 655560. Its totient is φ = 640816.

The previous prime is 648181. The next prime is 648191. The reversal of 648187 is 781846.

It is a happy number.

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 648187 - 2⁷ = 648059 is a prime.

It is a Duffinian number.

648187 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (648181) 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, 3553 + ... + 3730.

It is an arithmetic number, because the mean of its divisors is an integer number (163890).

2⁶⁴⁸¹⁸⁷ is an apocalyptic number.

648187 is a deficient number, since it is larger than the sum of its proper divisors (7373).

648187 is an equidigital number, since it uses as much as digits as its factorization.

648187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7372.

The product of its digits is 10752, while the sum is 34.

The square root of 648187 is about 805.1006148302. The cubic root of 648187 is about 86.5432975126.

The spelling of 648187 in words is "six hundred forty-eight thousand, one hundred eighty-seven".