628172707 has 4 divisors (see below), whose sum is σ = 628749576. Its totient is φ = 627595840.

The previous prime is 628172689. The next prime is 628172723. The reversal of 628172707 is 707271826.

628172707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 628172707 - 2⁷ = 628172579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628172707.

It is not an unprimeable number, because it can be changed into a prime (628172807) 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, 286798 + ... + 288979.

It is an arithmetic number, because the mean of its divisors is an integer number (157187394).

Almost surely, 2^628172707 is an apocalyptic number.

628172707 is a deficient number, since it is larger than the sum of its proper divisors (576869).

628172707 is a wasteful number, since it uses less digits than its factorization.

628172707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576868.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 628172707 is about 25063.3738151910. The cubic root of 628172707 is about 856.4322662268.

The spelling of 628172707 in words is "six hundred twenty-eight million, one hundred seventy-two thousand, seven hundred seven".