628956173231 has 4 divisors (see below), whose sum is σ = 628961272752. Its totient is φ = 628951073712.

The previous prime is 628956173227. The next prime is 628956173267. The reversal of 628956173231 is 132371659826.

It is a happy number.

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 628956173231 - 2² = 628956173227 is a prime.

It is a super-2 number, since 2×628956173231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628956172231) 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, 2360051 + ... + 2612996.

It is an arithmetic number, because the mean of its divisors is an integer number (157240318188).

Almost surely, 2^628956173231 is an apocalyptic number.

628956173231 is a deficient number, since it is larger than the sum of its proper divisors (5099521).

628956173231 is a wasteful number, since it uses less digits than its factorization.

628956173231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5099520.

The product of its digits is 3265920, while the sum is 53.

The spelling of 628956173231 in words is "six hundred twenty-eight billion, nine hundred fifty-six million, one hundred seventy-three thousand, two hundred thirty-one".