620249306 has 4 divisors (see below), whose sum is σ = 930373962. Its totient is φ = 310124652.

The previous prime is 620249299. The next prime is 620249309. The reversal of 620249306 is 603942026.

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

It can be written as a sum of positive squares in only one way, i.e., 515698681 + 104550625 = 22709^2 + 10225^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620249309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155062325 + ... + 155062328.

Almost surely, 2^620249306 is an apocalyptic number.

620249306 is a deficient number, since it is larger than the sum of its proper divisors (310124656).

620249306 is a wasteful number, since it uses less digits than its factorization.

620249306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310124655.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 620249306 is about 24904.8048777741. The cubic root of 620249306 is about 852.8161753239.

The spelling of 620249306 in words is "six hundred twenty million, two hundred forty-nine thousand, three hundred six".