648020261 has 8 divisors (see below), whose sum is σ = 740762880. Its totient is φ = 555319728.

The previous prime is 648020231. The next prime is 648020273. The reversal of 648020261 is 162020846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648020261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648020201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36500 + ... + 51266.

It is an arithmetic number, because the mean of its divisors is an integer number (92595360).

Almost surely, 2^648020261 is an apocalyptic number.

It is an amenable number.

648020261 is a deficient number, since it is larger than the sum of its proper divisors (92742619).

648020261 is a wasteful number, since it uses less digits than its factorization.

648020261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21043.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 648020261 is about 25456.2420832298. The cubic root of 648020261 is about 865.3587610468.

The spelling of 648020261 in words is "six hundred forty-eight million, twenty thousand, two hundred sixty-one".