628005663 has 16 divisors (see below), whose sum is σ = 931231840. Its totient is φ = 418286592.

The previous prime is 628005611. The next prime is 628005683. The reversal of 628005663 is 366500826.

It is not a de Polignac number, because 628005663 - 2⁸ = 628005407 is a prime.

It is a super-2 number, since 2×628005663² = 788782225520139138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628005683) 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, 21045 + ... + 41217.

It is an arithmetic number, because the mean of its divisors is an integer number (58201990).

Almost surely, 2^628005663 is an apocalyptic number.

628005663 is a deficient number, since it is larger than the sum of its proper divisors (303226177).

628005663 is a wasteful number, since it uses less digits than its factorization.

628005663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21335 (or 21329 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 628005663 is about 25060.0411611793. The cubic root of 628005663 is about 856.3563451981.

The spelling of 628005663 in words is "six hundred twenty-eight million, five thousand, six hundred sixty-three".