649937618 has 16 divisors (see below), whose sum is σ = 1100208960. Its totient is φ = 285238800.

The previous prime is 649937609. The next prime is 649937653. The reversal of 649937618 is 816739946.

649937618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 649937618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508718 + ... + 509993.

It is an arithmetic number, because the mean of its divisors is an integer number (68763060).

Almost surely, 2^649937618 is an apocalyptic number.

649937618 is a deficient number, since it is larger than the sum of its proper divisors (450271342).

649937618 is a wasteful number, since it uses less digits than its factorization.

649937618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018753.

The product of its digits is 1959552, while the sum is 53.

The square root of 649937618 is about 25493.8741269349. The cubic root of 649937618 is about 866.2113927990.

The spelling of 649937618 in words is "six hundred forty-nine million, nine hundred thirty-seven thousand, six hundred eighteen".