620036644 has 6 divisors (see below), whose sum is σ = 1085064134. Its totient is φ = 310018320.

The previous prime is 620036609. The next prime is 620036663. The reversal of 620036644 is 446630026.

It can be written as a sum of positive squares in only one way, i.e., 619412544 + 624100 = 24888^2 + 790^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77504577 + ... + 77504584.

Almost surely, 2^620036644 is an apocalyptic number.

It is an amenable number.

620036644 is a deficient number, since it is larger than the sum of its proper divisors (465027490).

620036644 is a wasteful number, since it uses less digits than its factorization.

620036644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155009165 (or 155009163 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 620036644 is about 24900.5350143325. The cubic root of 620036644 is about 852.7186971415.

The spelling of 620036644 in words is "six hundred twenty million, thirty-six thousand, six hundred forty-four".