628138567 has 4 divisors (see below), whose sum is σ = 717872656. Its totient is φ = 538404480.

The previous prime is 628138547. The next prime is 628138591. The reversal of 628138567 is 765831826.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628138567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628138507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44867034 + ... + 44867047.

It is an arithmetic number, because the mean of its divisors is an integer number (179468164).

Almost surely, 2^628138567 is an apocalyptic number.

628138567 is a deficient number, since it is larger than the sum of its proper divisors (89734089).

628138567 is an equidigital number, since it uses as much as digits as its factorization.

628138567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89734088.

The product of its digits is 483840, while the sum is 46.

The square root of 628138567 is about 25062.6927324260. The cubic root of 628138567 is about 856.4167507871.

The spelling of 628138567 in words is "six hundred twenty-eight million, one hundred thirty-eight thousand, five hundred sixty-seven".