628681505 has 8 divisors (see below), whose sum is σ = 798795432. Its totient is φ = 473360128.

The previous prime is 628681483. The next prime is 628681507. The reversal of 628681505 is 505186826.

628681505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 90859024 + 537822481 = 9532^2 + 23191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628681505 - 2⁶ = 628681441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628681507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3698042 + ... + 3698211.

It is an arithmetic number, because the mean of its divisors is an integer number (99849429).

Almost surely, 2^628681505 is an apocalyptic number.

It is an amenable number.

628681505 is a deficient number, since it is larger than the sum of its proper divisors (170113927).

628681505 is a wasteful number, since it uses less digits than its factorization.

628681505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396275.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 628681505 is about 25073.5219903387. The cubic root of 628681505 is about 856.6634305890.

The spelling of 628681505 in words is "six hundred twenty-eight million, six hundred eighty-one thousand, five hundred five".