649590 has 32 divisors (see below), whose sum is σ = 1589760. Its totient is φ = 169824.

The previous prime is 649577. The next prime is 649613. The reversal of 649590 is 95946.

It is a happy number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649590.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1587 + ... + 1953.

It is an arithmetic number, because the mean of its divisors is an integer number (49680).

2⁶⁴⁹⁵⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (794880).

649590 is an abundant number, since it is smaller than the sum of its proper divisors (940170).

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

649590 is a wasteful number, since it uses less digits than its factorization.

649590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 649590 is about 805.9714635147. The cubic root of 649590 is about 86.6056934708.

The spelling of 649590 in words is "six hundred forty-nine thousand, five hundred ninety".