649788 has 24 divisors (see below), whose sum is σ = 1529808. Its totient is φ = 214656.

The previous prime is 649787. The next prime is 649793. The reversal of 649788 is 887946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649783) 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 7 ways as a sum of consecutive naturals, for example, 1920 + ... + 2232.

It is an arithmetic number, because the mean of its divisors is an integer number (63742).

2⁶⁴⁹⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

649788 is an abundant number, since it is smaller than the sum of its proper divisors (880020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649788 is a wasteful number, since it uses less digits than its factorization.

649788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 491 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 649788 is about 806.0942872890. The cubic root of 649788 is about 86.6144919362.

It can be divided in two parts, 6 and 49788, that added together give a palindrome (49794).

The spelling of 649788 in words is "six hundred forty-nine thousand, seven hundred eighty-eight".