649345720 has 32 divisors (see below), whose sum is σ = 1470348000. Its totient is φ = 258081408.

The previous prime is 649345679. The next prime is 649345727. The reversal of 649345720 is 27543946.

It is a happy number.

649345720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649345727) 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, 45420 + ... + 57979.

It is an arithmetic number, because the mean of its divisors is an integer number (45948375).

Almost surely, 2^649345720 is an apocalyptic number.

It is an amenable number.

649345720 is an abundant number, since it is smaller than the sum of its proper divisors (821002280).

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

649345720 is a wasteful number, since it uses less digits than its factorization.

649345720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103567 (or 103563 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 649345720 is about 25482.2628508537. The cubic root of 649345720 is about 865.9483601136.

The spelling of 649345720 in words is "six hundred forty-nine million, three hundred forty-five thousand, seven hundred twenty".