628878842 has 4 divisors (see below), whose sum is σ = 943318266. Its totient is φ = 314439420.

The previous prime is 628878821. The next prime is 628878851. The reversal of 628878842 is 248878826.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 597753601 + 31125241 = 24449^2 + 5579^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157219709 + ... + 157219712.

Almost surely, 2^628878842 is an apocalyptic number.

628878842 is a deficient number, since it is larger than the sum of its proper divisors (314439424).

628878842 is a wasteful number, since it uses less digits than its factorization.

628878842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314439423.

The product of its digits is 2752512, while the sum is 53.

The square root of 628878842 is about 25077.4568487317. The cubic root of 628878842 is about 856.7530539808.

The spelling of 628878842 in words is "six hundred twenty-eight million, eight hundred seventy-eight thousand, eight hundred forty-two".