628834623649 has 4 divisors (see below), whose sum is σ = 630125865664. Its totient is φ = 627543381636.

The previous prime is 628834623623. The next prime is 628834623667. The reversal of 628834623649 is 946326438826.

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.

It is a cyclic number.

It is not a de Polignac number, because 628834623649 - 2¹⁷ = 628834492577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628834623449) 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, 645620277 + ... + 645621250.

It is an arithmetic number, because the mean of its divisors is an integer number (157531466416).

Almost surely, 2^628834623649 is an apocalyptic number.

It is an amenable number.

628834623649 is a deficient number, since it is larger than the sum of its proper divisors (1291242015).

628834623649 is a wasteful number, since it uses less digits than its factorization.

628834623649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291242014.

The product of its digits is 71663616, while the sum is 61.

The spelling of 628834623649 in words is "six hundred twenty-eight billion, eight hundred thirty-four million, six hundred twenty-three thousand, six hundred forty-nine".