649958128 has 40 divisors (see below), whose sum is σ = 1280052000. Its totient is φ = 319647744.

The previous prime is 649958123. The next prime is 649958191. The reversal of 649958128 is 821859946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649958123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699168 + ... + 700096.

It is an arithmetic number, because the mean of its divisors is an integer number (32001300).

Almost surely, 2^649958128 is an apocalyptic number.

It is an amenable number.

649958128 is a deficient number, since it is larger than the sum of its proper divisors (630093872).

649958128 is a wasteful number, since it uses less digits than its factorization.

649958128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1603 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 52.

The square root of 649958128 is about 25494.2763772577. The cubic root of 649958128 is about 866.2205043447.

The spelling of 649958128 in words is "six hundred forty-nine million, nine hundred fifty-eight thousand, one hundred twenty-eight".