646526 has 16 divisors (see below), whose sum is σ = 1023840. Its totient is φ = 305760.

The previous prime is 646523. The next prime is 646537. The reversal of 646526 is 625646.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4040 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (63990).

2⁶⁴⁶⁵²⁶ is an apocalyptic number.

646526 is a deficient number, since it is larger than the sum of its proper divisors (377314).

646526 is a wasteful number, since it uses less digits than its factorization.

646526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

The product of its digits is 8640, while the sum is 29.

The square root of 646526 is about 804.0684050502. The cubic root of 646526 is about 86.4693109527.

The spelling of 646526 in words is "six hundred forty-six thousand, five hundred twenty-six".