628051639 has 4 divisors (see below), whose sum is σ = 655358256. Its totient is φ = 600745024.

The previous prime is 628051601. The next prime is 628051649. The reversal of 628051639 is 936150826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628051639 - 2⁷ = 628051511 is a prime.

It is a super-2 number, since 2×628051639² = 788897722501172642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628051649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13653274 + ... + 13653319.

It is an arithmetic number, because the mean of its divisors is an integer number (163839564).

Almost surely, 2^628051639 is an apocalyptic number.

628051639 is a deficient number, since it is larger than the sum of its proper divisors (27306617).

628051639 is a wasteful number, since it uses less digits than its factorization.

628051639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27306616.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 628051639 is about 25060.9584613199. The cubic root of 628051639 is about 856.3772425036.

The spelling of 628051639 in words is "six hundred twenty-eight million, fifty-one thousand, six hundred thirty-nine".