1648447385 has 8 divisors (see below), whose sum is σ = 2130301320. Its totient is φ = 1217314944.

The previous prime is 1648447379. The next prime is 1648447397. The reversal of 1648447385 is 5837448461.

It can be written as a sum of positive squares in 4 ways, for example, as 324288064 + 1324159321 = 18008^2 + 36389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1648447385 - 2⁴ = 1648447369 is a prime.

It is a super-2 number, since 2×1648447385² = 5434757562226676450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12680300 + ... + 12680429.

It is an arithmetic number, because the mean of its divisors is an integer number (266287665).

Almost surely, 2^1648447385 is an apocalyptic number.

It is an amenable number.

1648447385 is a deficient number, since it is larger than the sum of its proper divisors (481853935).

1648447385 is a wasteful number, since it uses less digits than its factorization.

1648447385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25360747.

The product of its digits is 2580480, while the sum is 50.

The square root of 1648447385 is about 40601.0761556883. The cubic root of 1648447385 is about 1181.2949933498.

The spelling of 1648447385 in words is "one billion, six hundred forty-eight million, four hundred forty-seven thousand, three hundred eighty-five".