649306040 has 64 divisors (see below), whose sum is σ = 1480887360. Its totient is φ = 256204800.

The previous prime is 649306039. The next prime is 649306043. The reversal of 649306040 is 40603946.

It is a super-3 number, since 3×649306040³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 649305988 and 649306006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649306043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165442 + ... + 1165998.

It is an arithmetic number, because the mean of its divisors is an integer number (23138865).

Almost surely, 2^649306040 is an apocalyptic number.

It is an amenable number.

649306040 is an abundant number, since it is smaller than the sum of its proper divisors (831581320).

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

649306040 is a wasteful number, since it uses less digits than its factorization.

649306040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 649306040 is about 25481.4842581824. The cubic root of 649306040 is about 865.9307210605.

Adding to 649306040 its reverse (40603946), we get a palindrome (689909986).

The spelling of 649306040 in words is "six hundred forty-nine million, three hundred six thousand, forty".