649128530 has 32 divisors (see below), whose sum is σ = 1210180608. Its totient is φ = 250430400.

The previous prime is 649128497. The next prime is 649128539. The reversal of 649128530 is 35821946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (649128539) 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, 93044 + ... + 99776.

It is an arithmetic number, because the mean of its divisors is an integer number (37818144).

Almost surely, 2^649128530 is an apocalyptic number.

649128530 is a deficient number, since it is larger than the sum of its proper divisors (561052078).

649128530 is a wasteful number, since it uses less digits than its factorization.

649128530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 649128530 is about 25478.0009027396. Note that the first 3 decimals coincide. The cubic root of 649128530 is about 865.8518032815.

The spelling of 649128530 in words is "six hundred forty-nine million, one hundred twenty-eight thousand, five hundred thirty".