668620634 has 16 divisors (see below), whose sum is σ = 1112044896. Its totient is φ = 298935600.

The previous prime is 668620633. The next prime is 668620639. The reversal of 668620634 is 436026866.

It is a junction number, because it is equal to n+sod(n) for n = 668620591 and 668620600.

It is not an unprimeable number, because it can be changed into a prime (668620633) 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, 247772 + ... + 250455.

It is an arithmetic number, because the mean of its divisors is an integer number (69502806).

Almost surely, 2^668620634 is an apocalyptic number.

668620634 is a deficient number, since it is larger than the sum of its proper divisors (443424262).

668620634 is a wasteful number, since it uses less digits than its factorization.

668620634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498301.

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 668620634 is about 25857.6997043434. The cubic root of 668620634 is about 874.4331061069.

The spelling of 668620634 in words is "six hundred sixty-eight million, six hundred twenty thousand, six hundred thirty-four".