648436 has 6 divisors (see below), whose sum is σ = 1134770. Its totient is φ = 324216.

The previous prime is 648433. The next prime is 648437. The reversal of 648436 is 634846.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 24336 = 790^2 + 156^2 .

It is a super-4 number, since 4×648436⁴ (a number of 24 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648398 and 648407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648433) 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 as a sum of consecutive naturals, namely, 81051 + ... + 81058.

2⁶⁴⁸⁴³⁶ is an apocalyptic number.

It is an amenable number.

648436 is a deficient number, since it is larger than the sum of its proper divisors (486334).

648436 is a wasteful number, since it uses less digits than its factorization.

648436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162113 (or 162111 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 648436 is about 805.2552390392. The cubic root of 648436 is about 86.5543779170.

The spelling of 648436 in words is "six hundred forty-eight thousand, four hundred thirty-six".