620169649 has 18 divisors (see below), whose sum is σ = 698934950. Its totient is φ = 549859200.

The previous prime is 620169643. The next prime is 620169659. The reversal of 620169649 is 946961026.

It is a happy number.

620169649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 92640625 + 527529024 = 9625^2 + 22968^2 .

It is not a de Polignac number, because 620169649 - 2²³ = 611781041 is a prime.

It is a super-2 number, since 2×620169649² = 769220787081566402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620169643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 201877 + ... + 204925.

Almost surely, 2^620169649 is an apocalyptic number.

It is an amenable number.

620169649 is a deficient number, since it is larger than the sum of its proper divisors (78765301).

620169649 is a wasteful number, since it uses less digits than its factorization.

620169649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153 (or 3101 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 620169649 is about 24903.2055968705. The cubic root of 620169649 is about 852.7796654422.

The spelling of 620169649 in words is "six hundred twenty million, one hundred sixty-nine thousand, six hundred forty-nine".