628882581 has 16 divisors (see below), whose sum is σ = 899078400. Its totient is φ = 389595648.

The previous prime is 628882567. The next prime is 628882609. The reversal of 628882581 is 185288826.

It is a happy number.

It is not a de Polignac number, because 628882581 - 2⁹ = 628882069 is a prime.

It is a super-2 number, since 2×628882581² = 790986601370443122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 628882581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628882531) 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 15 ways as a sum of consecutive naturals, for example, 74016 + ... + 82073.

It is an arithmetic number, because the mean of its divisors is an integer number (56192400).

Almost surely, 2^628882581 is an apocalyptic number.

It is an amenable number.

628882581 is a deficient number, since it is larger than the sum of its proper divisors (270195819).

628882581 is a wasteful number, since it uses less digits than its factorization.

628882581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156188.

The product of its digits is 491520, while the sum is 48.

The square root of 628882581 is about 25077.5313976476. The cubic root of 628882581 is about 856.7547519196.

The spelling of 628882581 in words is "six hundred twenty-eight million, eight hundred eighty-two thousand, five hundred eighty-one".