648938090 has 16 divisors (see below), whose sum is σ = 1169352072. Its totient is φ = 259294464.

The previous prime is 648938089. The next prime is 648938113. The reversal of 648938090 is 90839846.

It can be written as a sum of positive squares in 4 ways, for example, as 452966089 + 195972001 = 21283^2 + 13999^2 .

It is a super-2 number, since 2×648938090² = 842241289305696200, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25259 + ... + 43998.

Almost surely, 2^648938090 is an apocalyptic number.

648938090 is a deficient number, since it is larger than the sum of its proper divisors (520413982).

648938090 is a wasteful number, since it uses less digits than its factorization.

648938090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70201.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 648938090 is about 25474.2632866978. The cubic root of 648938090 is about 865.7671210561.

The spelling of 648938090 in words is "six hundred forty-eight million, nine hundred thirty-eight thousand, ninety".