628145401 has 4 divisors (see below), whose sum is σ = 676464292. Its totient is φ = 579826512.

The previous prime is 628145389. The next prime is 628145407. The reversal of 628145401 is 104541826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104541826 = 2 ⋅52270913.

It can be written as a sum of positive squares in 2 ways, for example, as 420209001 + 207936400 = 20499^2 + 14420^2 .

It is a cyclic number.

It is not a de Polignac number, because 628145401 - 2²¹ = 626048249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628145407) 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, 24159426 + ... + 24159451.

It is an arithmetic number, because the mean of its divisors is an integer number (169116073).

Almost surely, 2^628145401 is an apocalyptic number.

It is an amenable number.

628145401 is a deficient number, since it is larger than the sum of its proper divisors (48318891).

628145401 is a wasteful number, since it uses less digits than its factorization.

628145401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48318890.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 628145401 is about 25062.8290701589. The cubic root of 628145401 is about 856.4198566469.

The spelling of 628145401 in words is "six hundred twenty-eight million, one hundred forty-five thousand, four hundred one".