628779995 has 8 divisors (see below), whose sum is σ = 760044384. Its totient is φ = 499351744.

The previous prime is 628779979. The next prime is 628779997. The reversal of 628779995 is 599977826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628779995 - 2⁴ = 628779979 is a prime.

It is a super-2 number, since 2×628779995² = 790728564224400050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628779997) 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 7 ways as a sum of consecutive naturals, for example, 458279 + ... + 459648.

It is an arithmetic number, because the mean of its divisors is an integer number (95005548).

Almost surely, 2^628779995 is an apocalyptic number.

628779995 is a deficient number, since it is larger than the sum of its proper divisors (131264389).

628779995 is a wasteful number, since it uses less digits than its factorization.

628779995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918069.

The product of its digits is 17146080, while the sum is 62.

The square root of 628779995 is about 25075.4859374649. The cubic root of 628779995 is about 856.7081635605.

The spelling of 628779995 in words is "six hundred twenty-eight million, seven hundred seventy-nine thousand, nine hundred ninety-five".