648438069 has 16 divisors (see below), whose sum is σ = 875957760. Its totient is φ = 426624000.

The previous prime is 648438053. The next prime is 648438073. The reversal of 648438069 is 960834846.

It is not a de Polignac number, because 648438069 - 2⁴ = 648438053 is a prime.

It is a super-2 number, since 2×648438069² = 840943858656897522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648438019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160069 + ... + 164069.

It is an arithmetic number, because the mean of its divisors is an integer number (54747360).

Almost surely, 2^648438069 is an apocalyptic number.

It is an amenable number.

648438069 is a deficient number, since it is larger than the sum of its proper divisors (227519691).

648438069 is a wasteful number, since it uses less digits than its factorization.

648438069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700.

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 648438069 is about 25464.4471567713. The cubic root of 648438069 is about 865.5446997483.

The spelling of 648438069 in words is "six hundred forty-eight million, four hundred thirty-eight thousand, sixty-nine".