649770 has 48 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 156640.

The previous prime is 649769. The next prime is 649771. The reversal of 649770 is 77946.

649770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (649769) and next prime (649771).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649770.

It is not an unprimeable number, because it can be changed into a prime (649771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3541 + ... + 3719.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2⁶⁴⁹⁷⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861840).

649770 is an abundant number, since it is smaller than the sum of its proper divisors (1073910).

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

649770 is a wasteful number, since it uses less digits than its factorization.

649770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 649770 is about 806.0831222647. The cubic root of 649770 is about 86.6136921496.

The spelling of 649770 in words is "six hundred forty-nine thousand, seven hundred seventy".