648819 has 6 divisors (see below), whose sum is σ = 937196. Its totient is φ = 432540.

The previous prime is 648803. The next prime is 648841. The reversal of 648819 is 918846.

648819 = 82² + 83² + ... + 135².

It is a happy number.

648819 is a `hidden beast` number, since 648 + 8 + 1 + 9 = 666.

It is not a de Polignac number, because 648819 - 2⁴ = 648803 is a prime.

It is a super-2 number, since 2×648819² = 841932189522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36037 + ... + 36054.

2⁶⁴⁸⁸¹⁹ is an apocalyptic number.

648819 is a deficient number, since it is larger than the sum of its proper divisors (288377).

648819 is a wasteful number, since it uses less digits than its factorization.

648819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72097 (or 72094 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 648819 is about 805.4930167295. The cubic root of 648819 is about 86.5714157342.

The spelling of 648819 in words is "six hundred forty-eight thousand, eight hundred nineteen".