648224690 has 8 divisors (see below), whose sum is σ = 1166804460. Its totient is φ = 259289872.

The previous prime is 648224657. The next prime is 648224701. The reversal of 648224690 is 96422846.

It can be written as a sum of positive squares in 2 ways, for example, as 648160681 + 64009 = 25459^2 + 253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×648224690² = 840390497451192200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32411225 + ... + 32411244.

Almost surely, 2^648224690 is an apocalyptic number.

648224690 is a deficient number, since it is larger than the sum of its proper divisors (518579770).

648224690 is a wasteful number, since it uses less digits than its factorization.

648224690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64822476.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 648224690 is about 25460.2570686158. The cubic root of 648224690 is about 865.4497488536.

The spelling of 648224690 in words is "six hundred forty-eight million, two hundred twenty-four thousand, six hundred ninety".