620491770369 has 27 divisors (see below), whose sum is σ = 903238391523. Its totient is φ = 410467791744.

The previous prime is 620491770299. The next prime is 620491770383. The reversal of 620491770369 is 963077194026.

It is a happy number.

The square root of 620491770369 is 787713.

It is a perfect power (a square), and thus also a powerful number.

620491770369 is a `hidden beast` number, since 6 + 20 + 491 + 7 + 70 + 3 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 298866675969 + 321625094400 = 546687^2 + 567120^2 .

It is not a de Polignac number, because 620491770369 - 2⁹ = 620491769857 is a prime.

It is a super-2 number, since 2×620491770369² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (620491770169) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 328475377 + ... + 328477265.

Almost surely, 2^620491770369 is an apocalyptic number.

620491770369 is the 787713-rd square number.

620491770369 is the 393857-th centered octagonal number.

It is an amenable number.

620491770369 is a deficient number, since it is larger than the sum of its proper divisors (282746621154).

620491770369 is an frugal number, since it uses more digits than its factorization.

620491770369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062 (or 2031 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 620491770369 in words is "six hundred twenty billion, four hundred ninety-one million, seven hundred seventy thousand, three hundred sixty-nine".