649220224 has 32 divisors (see below), whose sum is σ = 1306727100. Its totient is φ = 321257472.

The previous prime is 649220213. The next prime is 649220251. The reversal of 649220224 is 422022946.

It can be written as a sum of positive squares in 2 ways, for example, as 646786624 + 2433600 = 25432^2 + 1560^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×649220224² = 842973798501220352, 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, 13729 + ... + 38560.

Almost surely, 2^649220224 is an apocalyptic number.

649220224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

649220224 is an abundant number, since it is smaller than the sum of its proper divisors (657506876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649220224 is an equidigital number, since it uses as much as digits as its factorization.

649220224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52400 (or 52388 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 649220224 is about 25479.8003131893. The cubic root of 649220224 is about 865.8925705942.

The spelling of 649220224 in words is "six hundred forty-nine million, two hundred twenty thousand, two hundred twenty-four".