628973979 has 4 divisors (see below), whose sum is σ = 838631976. Its totient is φ = 419315984.

The previous prime is 628973963. The next prime is 628973981. The reversal of 628973979 is 979379826.

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 628973979 - 2⁴ = 628973963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628973999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104828994 + ... + 104828999.

It is an arithmetic number, because the mean of its divisors is an integer number (209657994).

Almost surely, 2^628973979 is an apocalyptic number.

628973979 is a deficient number, since it is larger than the sum of its proper divisors (209657997).

628973979 is a wasteful number, since it uses less digits than its factorization.

628973979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209657996.

The product of its digits is 10287648, while the sum is 60.

The square root of 628973979 is about 25079.3536399964. The cubic root of 628973979 is about 856.7962550979.

The spelling of 628973979 in words is "six hundred twenty-eight million, nine hundred seventy-three thousand, nine hundred seventy-nine".