620664769 has 4 divisors (see below), whose sum is σ = 625402800. Its totient is φ = 615926740.

The previous prime is 620664767. The next prime is 620664853. The reversal of 620664769 is 967466026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 967466026 = 2 ⋅483733013.

It is a cyclic number.

It is not a de Polignac number, because 620664769 - 2¹ = 620664767 is a prime.

It is a super-2 number, since 2×620664769² = 770449510955646722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620664763) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2368819 + ... + 2369080.

It is an arithmetic number, because the mean of its divisors is an integer number (156350700).

Almost surely, 2^620664769 is an apocalyptic number.

It is an amenable number.

620664769 is a deficient number, since it is larger than the sum of its proper divisors (4738031).

620664769 is a wasteful number, since it uses less digits than its factorization.

620664769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738030.

The product of its (nonzero) digits is 653184, while the sum is 46.

The square root of 620664769 is about 24913.1445024509. The cubic root of 620664769 is about 853.0065474224.

The spelling of 620664769 in words is "six hundred twenty million, six hundred sixty-four thousand, seven hundred sixty-nine".