648756890 has 32 divisors (see below), whose sum is σ = 1269884304. Its totient is φ = 237634560.

The previous prime is 648756887. The next prime is 648756893. The reversal of 648756890 is 98657846.

It is an interprime number because it is at equal distance from previous prime (648756887) and next prime (648756893).

It can be written as a sum of positive squares in 8 ways, for example, as 639533521 + 9223369 = 25289^2 + 3037^2 .

It is not an unprimeable number, because it can be changed into a prime (648756893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45281 + ... + 57860.

Almost surely, 2^648756890 is an apocalyptic number.

648756890 is a deficient number, since it is larger than the sum of its proper divisors (621127414).

648756890 is a wasteful number, since it uses less digits than its factorization.

648756890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103202.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 648756890 is about 25470.7065076727. The cubic root of 648756890 is about 865.6865321636.

The spelling of 648756890 in words is "six hundred forty-eight million, seven hundred fifty-six thousand, eight hundred ninety".