649224578 has 18 divisors (see below), whose sum is σ = 999396099. Its totient is φ = 316306452.

The previous prime is 649224529. The next prime is 649224581. The reversal of 649224578 is 875422946.

It can be written as a sum of positive squares in only one way, i.e., 324612289 + 324612289 = 18017^2 + 18017^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18017.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1549253 + ... + 1549671.

Almost surely, 2^649224578 is an apocalyptic number.

649224578 is a deficient number, since it is larger than the sum of its proper divisors (350171521).

649224578 is an frugal number, since it uses more digits than its factorization.

649224578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 464 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The square root of 649224578 is about 25479.8857532761. The cubic root of 649224578 is about 865.8945062947.

The spelling of 649224578 in words is "six hundred forty-nine million, two hundred twenty-four thousand, five hundred seventy-eight".