628691441 has 4 divisors (see below), whose sum is σ = 718504512. Its totient is φ = 538878372.

The previous prime is 628691431. The next prime is 628691449. The reversal of 628691441 is 144196826.

628691441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 628691441 - 2¹⁴ = 628675057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628691449) 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, 44906525 + ... + 44906538.

It is an arithmetic number, because the mean of its divisors is an integer number (179626128).

Almost surely, 2^628691441 is an apocalyptic number.

It is an amenable number.

628691441 is a deficient number, since it is larger than the sum of its proper divisors (89813071).

628691441 is an equidigital number, since it uses as much as digits as its factorization.

628691441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89813070.

The product of its digits is 82944, while the sum is 41.

The square root of 628691441 is about 25073.7201268579. The cubic root of 628691441 is about 856.6679436123.

The spelling of 628691441 in words is "six hundred twenty-eight million, six hundred ninety-one thousand, four hundred forty-one".