649538570 has 16 divisors (see below), whose sum is σ = 1169751240. Its totient is φ = 259686144.

The previous prime is 649538557. The next prime is 649538581. The reversal of 649538570 is 75835946.

It can be written as a sum of positive squares in 4 ways, for example, as 393506569 + 256032001 = 19837^2 + 16001^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6446 + ... + 36614.

Almost surely, 2^649538570 is an apocalyptic number.

649538570 is a deficient number, since it is larger than the sum of its proper divisors (520212670).

649538570 is a wasteful number, since it uses less digits than its factorization.

649538570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32329.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 649538570 is about 25486.0465745474. The cubic root of 649538570 is about 866.0340779916.

The spelling of 649538570 in words is "six hundred forty-nine million, five hundred thirty-eight thousand, five hundred seventy".