646753436 has 24 divisors (see below), whose sum is σ = 1302956256. Its totient is φ = 275155200.

The previous prime is 646753421. The next prime is 646753439. The reversal of 646753436 is 634357646.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646753439) 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, 80465 + ... + 88136.

It is an arithmetic number, because the mean of its divisors is an integer number (54289844).

Almost surely, 2^646753436 is an apocalyptic number.

It is an amenable number.

646753436 is an abundant number, since it is smaller than the sum of its proper divisors (656202820).

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

646753436 is a wasteful number, since it uses less digits than its factorization.

646753436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168749 (or 168747 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 44.

The square root of 646753436 is about 25431.3475065715. The cubic root of 646753436 is about 864.7944920368.

The spelling of 646753436 in words is "six hundred forty-six million, seven hundred fifty-three thousand, four hundred thirty-six".