649400655 has 32 divisors (see below), whose sum is σ = 1052932608. Its totient is φ = 341744000.

The previous prime is 649400651. The next prime is 649400671. The reversal of 649400655 is 556004946.

649400655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 649400655 - 2² = 649400651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649400651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498505 + ... + 499805.

It is an arithmetic number, because the mean of its divisors is an integer number (32904144).

Almost surely, 2^649400655 is an apocalyptic number.

649400655 is a deficient number, since it is larger than the sum of its proper divisors (403531953).

649400655 is a wasteful number, since it uses less digits than its factorization.

649400655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 649400655 is about 25483.3407346839. The cubic root of 649400655 is about 865.9727793253.

The spelling of 649400655 in words is "six hundred forty-nine million, four hundred thousand, six hundred fifty-five".