628128001 has 4 divisors (see below), whose sum is σ = 628204612. Its totient is φ = 628051392.

The previous prime is 628127987. The next prime is 628128013. The reversal of 628128001 is 100821826.

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 354192400 + 273935601 = 18820^2 + 16551^2 .

It is a cyclic number.

It is not a de Polignac number, because 628128001 - 2²¹ = 626030849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628128031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24300 + ... + 42973.

It is an arithmetic number, because the mean of its divisors is an integer number (157051153).

Almost surely, 2^628128001 is an apocalyptic number.

It is an amenable number.

628128001 is a deficient number, since it is larger than the sum of its proper divisors (76611).

628128001 is an equidigital number, since it uses as much as digits as its factorization.

628128001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76610.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 628128001 is about 25062.4819401431. The cubic root of 628128001 is about 856.4119487946.

Adding to 628128001 its reverse (100821826), we get a palindrome (728949827).

The spelling of 628128001 in words is "six hundred twenty-eight million, one hundred twenty-eight thousand, one".