628649434849 has 4 divisors (see below), whose sum is σ = 628765577236. Its totient is φ = 628533292464.

The previous prime is 628649434843. The next prime is 628649434867. The reversal of 628649434849 is 948434946826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948434946826 = 2 ⋅474217473413.

It can be written as a sum of positive squares in 2 ways, for example, as 71845441600 + 556803993249 = 268040^2 + 746193^2 .

It is a cyclic number.

It is not a de Polignac number, because 628649434849 - 2²¹ = 628647337697 is a prime.

It is a super-2 number, since 2×628649434849² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628649434843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58063074 + ... + 58073899.

It is an arithmetic number, because the mean of its divisors is an integer number (157191394309).

Almost surely, 2^628649434849 is an apocalyptic number.

It is an amenable number.

628649434849 is a deficient number, since it is larger than the sum of its proper divisors (116142387).

628649434849 is a wasteful number, since it uses less digits than its factorization.

628649434849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116142386.

The product of its digits is 286654464, while the sum is 67.

The spelling of 628649434849 in words is "six hundred twenty-eight billion, six hundred forty-nine million, four hundred thirty-four thousand, eight hundred forty-nine".