628669649 has 16 divisors (see below), whose sum is σ = 668259072. Its totient is φ = 590185728.

The previous prime is 628669637. The next prime is 628669651. The reversal of 628669649 is 946966826.

It is not a de Polignac number, because 628669649 - 2⁴ = 628669633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628669594 and 628669603.

It is not an unprimeable number, because it can be changed into a prime (628669609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390404 + ... + 392010.

It is an arithmetic number, because the mean of its divisors is an integer number (41766192).

Almost surely, 2^628669649 is an apocalyptic number.

It is an amenable number.

628669649 is a deficient number, since it is larger than the sum of its proper divisors (39589423).

628669649 is a wasteful number, since it uses less digits than its factorization.

628669649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 6718464, while the sum is 56.

The square root of 628669649 is about 25073.2855645207. The cubic root of 628669649 is about 856.6580454215.

The spelling of 628669649 in words is "six hundred twenty-eight million, six hundred sixty-nine thousand, six hundred forty-nine".