649690738 has 4 divisors (see below), whose sum is σ = 974536110. Its totient is φ = 324845368.

The previous prime is 649690721. The next prime is 649690739. The reversal of 649690738 is 837096946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 638421289 + 11269449 = 25267^2 + 3357^2 .

It is not an unprimeable number, because it can be changed into a prime (649690739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162422683 + ... + 162422686.

Almost surely, 2^649690738 is an apocalyptic number.

649690738 is a deficient number, since it is larger than the sum of its proper divisors (324845372).

649690738 is a wasteful number, since it uses less digits than its factorization.

649690738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324845371.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 649690738 is about 25489.0317195456. The cubic root of 649690738 is about 866.1017015786.

The spelling of 649690738 in words is "six hundred forty-nine million, six hundred ninety thousand, seven hundred thirty-eight".