649978004 has 12 divisors (see below), whose sum is σ = 1224958644. Its totient is φ = 299989824.

The previous prime is 649978003. The next prime is 649978019. The reversal of 649978004 is 400879946.

649978004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 183331600 + 466646404 = 13540^2 + 21602^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 649978004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649978003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6249737 + ... + 6249840.

It is an arithmetic number, because the mean of its divisors is an integer number (102079887).

Almost surely, 2^649978004 is an apocalyptic number.

It is an amenable number.

649978004 is a deficient number, since it is larger than the sum of its proper divisors (574980640).

649978004 is a wasteful number, since it uses less digits than its factorization.

649978004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499594 (or 12499592 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 649978004 is about 25494.6661872636. Note that the first 3 decimals coincide. The cubic root of 649978004 is about 866.2293340536.

The spelling of 649978004 in words is "six hundred forty-nine million, nine hundred seventy-eight thousand, four".