649675402 has 4 divisors (see below), whose sum is σ = 974513106. Its totient is φ = 324837700.

The previous prime is 649675363. The next prime is 649675409. The reversal of 649675402 is 204576946.

It is a happy number.

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., 453647401 + 196028001 = 21299^2 + 14001^2 .

It is not an unprimeable number, because it can be changed into a prime (649675409) by changing a digit.

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 as a sum of consecutive naturals, namely, 162418849 + ... + 162418852.

Almost surely, 2^649675402 is an apocalyptic number.

649675402 is a deficient number, since it is larger than the sum of its proper divisors (324837704).

649675402 is a wasteful number, since it uses less digits than its factorization.

649675402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324837703.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 649675402 is about 25488.7308824900. The cubic root of 649675402 is about 866.0948867258.

The spelling of 649675402 in words is "six hundred forty-nine million, six hundred seventy-five thousand, four hundred two".