648861 has 8 divisors (see below), whose sum is σ = 893184. Its totient is φ = 418560.

The previous prime is 648859. The next prime is 648863. The reversal of 648861 is 168846.

It is an interprime number because it is at equal distance from previous prime (648859) and next prime (648863).

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

It is not a de Polignac number, because 648861 - 2¹ = 648859 is a prime.

648861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648863) 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, 3396 + ... + 3581.

It is an arithmetic number, because the mean of its divisors is an integer number (111648).

2⁶⁴⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

648861 is a deficient number, since it is larger than the sum of its proper divisors (244323).

648861 is a wasteful number, since it uses less digits than its factorization.

648861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011.

The product of its digits is 9216, while the sum is 33.

The square root of 648861 is about 805.5190872971. The cubic root of 648861 is about 86.5732837030.

The spelling of 648861 in words is "six hundred forty-eight thousand, eight hundred sixty-one".