649563387 has 32 divisors (see below), whose sum is σ = 1002585600. Its totient is φ = 369707520.

The previous prime is 649563377. The next prime is 649563403. The reversal of 649563387 is 783365946.

It is not a de Polignac number, because 649563387 - 2⁴ = 649563371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (649563307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 335073 + ... + 337005.

It is an arithmetic number, because the mean of its divisors is an integer number (31330800).

Almost surely, 2^649563387 is an apocalyptic number.

649563387 is a deficient number, since it is larger than the sum of its proper divisors (353022213).

649563387 is a wasteful number, since it uses less digits than its factorization.

649563387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its digits is 3265920, while the sum is 51.

The square root of 649563387 is about 25486.5334441544. The cubic root of 649563387 is about 866.0451074080.

The spelling of 649563387 in words is "six hundred forty-nine million, five hundred sixty-three thousand, three hundred eighty-seven".