648039990 has 32 divisors (see below), whose sum is σ = 1674935136. Its totient is φ = 159517440.

The previous prime is 648039929. The next prime is 648039991. The reversal of 648039990 is 99930846.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648039991) 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 in 15 ways as a sum of consecutive naturals, for example, 830431 + ... + 831210.

It is an arithmetic number, because the mean of its divisors is an integer number (52341723).

Almost surely, 2^648039990 is an apocalyptic number.

648039990 is an abundant number, since it is smaller than the sum of its proper divisors (1026895146).

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

648039990 is a wasteful number, since it uses less digits than its factorization.

648039990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661664.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 648039990 is about 25456.6295883803. The cubic root of 648039990 is about 865.3675429171.

The spelling of 648039990 in words is "six hundred forty-eight million, thirty-nine thousand, nine hundred ninety".