649415385 has 24 divisors (see below), whose sum is σ = 1191869640. Its totient is φ = 325980672.

The previous prime is 649415381. The next prime is 649415387. The reversal of 649415385 is 583514946.

649415385 is a `hidden beast` number, since 6 + 494 + 153 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4052169 + 645363216 = 2013^2 + 25404^2 .

It is not a de Polignac number, because 649415385 - 2² = 649415381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 649415385.

It is not an unprimeable number, because it can be changed into a prime (649415381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423690 + ... + 425219.

It is an arithmetic number, because the mean of its divisors is an integer number (49661235).

Almost surely, 2^649415385 is an apocalyptic number.

It is an amenable number.

649415385 is a deficient number, since it is larger than the sum of its proper divisors (542454255).

649415385 is a wasteful number, since it uses less digits than its factorization.

649415385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848937 (or 848934 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 649415385 is about 25483.6297453875. The cubic root of 649415385 is about 865.9793267381.

The spelling of 649415385 in words is "six hundred forty-nine million, four hundred fifteen thousand, three hundred eighty-five".