649075538 has 8 divisors (see below), whose sum is σ = 1030884732. Its totient is φ = 305447296.

The previous prime is 649075519. The next prime is 649075561. The reversal of 649075538 is 835570946.

It can be written as a sum of positive squares in 2 ways, for example, as 600397009 + 48678529 = 24503^2 + 6977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 649075492 and 649075501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9545195 + ... + 9545262.

Almost surely, 2^649075538 is an apocalyptic number.

649075538 is a deficient number, since it is larger than the sum of its proper divisors (381809194).

649075538 is a wasteful number, since it uses less digits than its factorization.

649075538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19090476.

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

The square root of 649075538 is about 25476.9609255107. The cubic root of 649075538 is about 865.8282411951.

It can be divided in two parts, 6490 and 75538, that added together give a palindrome (82028).

The spelling of 649075538 in words is "six hundred forty-nine million, seventy-five thousand, five hundred thirty-eight".