628450668 has 18 divisors (see below), whose sum is σ = 1588583724. Its totient is φ = 209483544.

The previous prime is 628450663. The next prime is 628450673. The reversal of 628450668 is 866054826.

628450668 is a `hidden beast` number, since 6 + 2 + 84 + 506 + 68 = 666.

It is an interprime number because it is at equal distance from previous prime (628450663) and next prime (628450673).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (628450663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8728446 + ... + 8728517.

Almost surely, 2^628450668 is an apocalyptic number.

It is an amenable number.

628450668 is an abundant number, since it is smaller than the sum of its proper divisors (960133056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628450668 is a wasteful number, since it uses less digits than its factorization.

628450668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17456973 (or 17456968 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 628450668 is about 25068.9183651788. The cubic root of 628450668 is about 856.5585688942.

The spelling of 628450668 in words is "six hundred twenty-eight million, four hundred fifty thousand, six hundred sixty-eight".