620648242 has 16 divisors (see below), whose sum is σ = 958644792. Its totient is φ = 301178880.

The previous prime is 620648239. The next prime is 620648251. The reversal of 620648242 is 242846026.

It can be written as a sum of positive squares in 4 ways, for example, as 174213601 + 446434641 = 13199^2 + 21129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 620648198 and 620648207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3783 + ... + 35434.

Almost surely, 2^620648242 is an apocalyptic number.

620648242 is a deficient number, since it is larger than the sum of its proper divisors (337996550).

620648242 is a wasteful number, since it uses less digits than its factorization.

620648242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39453.

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 620648242 is about 24912.8128078706. The cubic root of 620648242 is about 852.9989760972.

The spelling of 620648242 in words is "six hundred twenty million, six hundred forty-eight thousand, two hundred forty-two".