628256901 has 8 divisors (see below), whose sum is σ = 848279680. Its totient is φ = 413536032.

The previous prime is 628256897. The next prime is 628256903. The reversal of 628256901 is 109652826.

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

It is not a de Polignac number, because 628256901 - 2² = 628256897 is a prime.

It is a Duffinian number.

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 628256901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628256903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325200 + ... + 1325673.

It is an arithmetic number, because the mean of its divisors is an integer number (106034960).

Almost surely, 2^628256901 is an apocalyptic number.

It is an amenable number.

628256901 is a deficient number, since it is larger than the sum of its proper divisors (220022779).

628256901 is a wasteful number, since it uses less digits than its factorization.

628256901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650955.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 628256901 is about 25065.0533811520. The cubic root of 628256901 is about 856.4705270619.

The spelling of 628256901 in words is "six hundred twenty-eight million, two hundred fifty-six thousand, nine hundred one".