649364856 has 160 divisors (see below), whose sum is σ = 1936051200. Its totient is φ = 181433280.

The previous prime is 649364803. The next prime is 649364869. The reversal of 649364856 is 658463946.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 649364799 and 649364808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3399721 + ... + 3399911.

It is an arithmetic number, because the mean of its divisors is an integer number (12100320).

Almost surely, 2^649364856 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 649364856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968025600).

649364856 is an abundant number, since it is smaller than the sum of its proper divisors (1286686344).

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

649364856 is a wasteful number, since it uses less digits than its factorization.

649364856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 262 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 51.

The square root of 649364856 is about 25482.6383249459. The cubic root of 649364856 is about 865.9568664324.

The spelling of 649364856 in words is "six hundred forty-nine million, three hundred sixty-four thousand, eight hundred fifty-six".