628642481 has 2 divisors, whose sum is σ = 628642482. Its totient is φ = 628642480.

The previous prime is 628642477. The next prime is 628642501. The reversal of 628642481 is 184246826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517972081 + 110670400 = 22759^2 + 10520^2 .

It is a cyclic number.

It is not a de Polignac number, because 628642481 - 2² = 628642477 is a prime.

It is a super-2 number, since 2×628642481² = 790382737835670722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628642471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314321240 + 314321241.

It is an arithmetic number, because the mean of its divisors is an integer number (314321241).

Almost surely, 2^628642481 is an apocalyptic number.

It is an amenable number.

628642481 is a deficient number, since it is larger than the sum of its proper divisors (1).

628642481 is an equidigital number, since it uses as much as digits as its factorization.

628642481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 41.

The square root of 628642481 is about 25072.7437868296. The cubic root of 628642481 is about 856.6457050660.

The spelling of 628642481 in words is "six hundred twenty-eight million, six hundred forty-two thousand, four hundred eighty-one".