648869 has 16 divisors (see below), whose sum is σ = 766080. Its totient is φ = 544320.

The previous prime is 648863. The next prime is 648871. The reversal of 648869 is 968846.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648869 is a prime.

It is a super-2 number, since 2×648869² = 842061958322, which contains 22 as substring.

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9104 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2⁶⁴⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

648869 is a deficient number, since it is larger than the sum of its proper divisors (117211).

648869 is a wasteful number, since it uses less digits than its factorization.

648869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140.

The product of its digits is 82944, while the sum is 41.

The square root of 648869 is about 805.5240530239. The cubic root of 648869 is about 86.5736394975.

The spelling of 648869 in words is "six hundred forty-eight thousand, eight hundred sixty-nine".