628488401 has 4 divisors (see below), whose sum is σ = 645474612. Its totient is φ = 611502192.

The previous prime is 628488397. The next prime is 628488431. The reversal of 628488401 is 104884826.

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

It can be written as a sum of positive squares in 2 ways, for example, as 306250000 + 322238401 = 17500^2 + 17951^2 .

It is a cyclic number.

It is not a de Polignac number, because 628488401 - 2² = 628488397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628488431) 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, 8493050 + ... + 8493123.

It is an arithmetic number, because the mean of its divisors is an integer number (161368653).

Almost surely, 2^628488401 is an apocalyptic number.

It is an amenable number.

628488401 is a deficient number, since it is larger than the sum of its proper divisors (16986211).

628488401 is a wasteful number, since it uses less digits than its factorization.

628488401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16986210.

The product of its (nonzero) digits is 98304, while the sum is 41.

The square root of 628488401 is about 25069.6709392046. The cubic root of 628488401 is about 856.5757115167.

The spelling of 628488401 in words is "six hundred twenty-eight million, four hundred eighty-eight thousand, four hundred one".