628655811 has 8 divisors (see below), whose sum is σ = 957951744. Its totient is φ = 359231880.

The previous prime is 628655771. The next prime is 628655821. The reversal of 628655811 is 118556826.

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

It is not a de Polignac number, because 628655811 - 2¹⁰ = 628654787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628655821) 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, 14967975 + ... + 14968016.

It is an arithmetic number, because the mean of its divisors is an integer number (119743968).

Almost surely, 2^628655811 is an apocalyptic number.

628655811 is a deficient number, since it is larger than the sum of its proper divisors (329295933).

628655811 is a wasteful number, since it uses less digits than its factorization.

628655811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29936001.

The product of its digits is 115200, while the sum is 42.

The square root of 628655811 is about 25073.0096119313. The cubic root of 628655811 is about 856.6517599153.

The spelling of 628655811 in words is "six hundred twenty-eight million, six hundred fifty-five thousand, eight hundred eleven".