649478720 has 56 divisors (see below), whose sum is σ = 1687177728. Its totient is φ = 236172800.

The previous prime is 649478717. The next prime is 649478749. The reversal of 649478720 is 27874946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88736 + ... + 95775.

Almost surely, 2^649478720 is an apocalyptic number.

It is an amenable number.

649478720 is an abundant number, since it is smaller than the sum of its proper divisors (1037699008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649478720 is a wasteful number, since it uses less digits than its factorization.

649478720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184539 (or 184529 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 649478720 is about 25484.8723755878. The cubic root of 649478720 is about 866.0074777075.

The spelling of 649478720 in words is "six hundred forty-nine million, four hundred seventy-eight thousand, seven hundred twenty".