628422387 has 8 divisors (see below), whose sum is σ = 845584080. Its totient is φ = 415104480.

The previous prime is 628422371. The next prime is 628422401. The reversal of 628422387 is 783224826.

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

It is not a de Polignac number, because 628422387 - 2⁴ = 628422371 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (628422787) 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, 960564 + ... + 961217.

It is an arithmetic number, because the mean of its divisors is an integer number (105698010).

Almost surely, 2^628422387 is an apocalyptic number.

628422387 is a deficient number, since it is larger than the sum of its proper divisors (217161693).

628422387 is a wasteful number, since it uses less digits than its factorization.

628422387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921893.

The product of its digits is 258048, while the sum is 42.

The square root of 628422387 is about 25068.3542938104. The cubic root of 628422387 is about 856.5457199958.

The spelling of 628422387 in words is "six hundred twenty-eight million, four hundred twenty-two thousand, three hundred eighty-seven".