628433879 has 4 divisors (see below), whose sum is σ = 640291176. Its totient is φ = 616576584.

The previous prime is 628433867. The next prime is 628433881. The reversal of 628433879 is 978334826.

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 628433879 - 2¹⁶ = 628368343 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 (628433809) 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, 5928569 + ... + 5928674.

It is an arithmetic number, because the mean of its divisors is an integer number (160072794).

Almost surely, 2^628433879 is an apocalyptic number.

628433879 is a deficient number, since it is larger than the sum of its proper divisors (11857297).

628433879 is a wasteful number, since it uses less digits than its factorization.

628433879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11857296.

The product of its digits is 1741824, while the sum is 50.

The square root of 628433879 is about 25068.5835060539. The cubic root of 628433879 is about 856.5509411993.

The spelling of 628433879 in words is "six hundred twenty-eight million, four hundred thirty-three thousand, eight hundred seventy-nine".