649887312 has 20 divisors (see below), whose sum is σ = 1678875680. Its totient is φ = 216629088.

The previous prime is 649887307. The next prime is 649887319. The reversal of 649887312 is 213788946.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 13539319 = 649887312 / (6 + 4 + 9 + 8 + 8 + 7 + 3 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649887319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6769612 + ... + 6769707.

It is an arithmetic number, because the mean of its divisors is an integer number (83943784).

Almost surely, 2^649887312 is an apocalyptic number.

It is an amenable number.

649887312 is an abundant number, since it is smaller than the sum of its proper divisors (1028988368).

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

649887312 is a wasteful number, since it uses less digits than its factorization.

649887312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13539330 (or 13539324 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 649887312 is about 25492.8874786675. The cubic root of 649887312 is about 866.1890436005.

The spelling of 649887312 in words is "six hundred forty-nine million, eight hundred eighty-seven thousand, three hundred twelve".