648476869 has 4 divisors (see below), whose sum is σ = 664293420. Its totient is φ = 632660320.

The previous prime is 648476831. The next prime is 648476893. The reversal of 648476869 is 968674846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232928644 + 415548225 = 15262^2 + 20385^2 .

It is a cyclic number.

It is not a de Polignac number, because 648476869 - 2¹¹ = 648474821 is a prime.

It is a super-2 number, since 2×648476869² = 841044499256086322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648476809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7908214 + ... + 7908295.

It is an arithmetic number, because the mean of its divisors is an integer number (166073355).

Almost surely, 2^648476869 is an apocalyptic number.

It is an amenable number.

648476869 is a deficient number, since it is larger than the sum of its proper divisors (15816551).

648476869 is a wasteful number, since it uses less digits than its factorization.

648476869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816550.

The product of its digits is 13934592, while the sum is 58.

The square root of 648476869 is about 25465.2089918775. The cubic root of 648476869 is about 865.5619630081.

The spelling of 648476869 in words is "six hundred forty-eight million, four hundred seventy-six thousand, eight hundred sixty-nine".