649428 has 48 divisors (see below), whose sum is σ = 1712256. Its totient is φ = 190080.

The previous prime is 649427. The next prime is 649457. The reversal of 649428 is 824946.

649428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3498 + ... + 3678.

It is an arithmetic number, because the mean of its divisors is an integer number (35672).

2⁶⁴⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856128).

649428 is an abundant number, since it is smaller than the sum of its proper divisors (1062828).

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

649428 is a wasteful number, since it uses less digits than its factorization.

649428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 222 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 649428 is about 805.8709574119. The cubic root of 649428 is about 86.5984933965.

It can be divided in two parts, 649 and 428, that multiplied together give a palindrome (277772).

The spelling of 649428 in words is "six hundred forty-nine thousand, four hundred twenty-eight".