668620320 has 48 divisors (see below), whose sum is σ = 2106155520. Its totient is φ = 178298624.

The previous prime is 668620297. The next prime is 668620339. The reversal of 668620320 is 23026866.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696000 + ... + 696959.

It is an arithmetic number, because the mean of its divisors is an integer number (43878240).

Almost surely, 2^668620320 is an apocalyptic number.

668620320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668620320 is an abundant number, since it is smaller than the sum of its proper divisors (1437535200).

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

668620320 is a wasteful number, since it uses less digits than its factorization.

668620320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392977 (or 1392969 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 668620320 is about 25857.6936326502. The cubic root of 668620320 is about 874.4329692221.

The spelling of 668620320 in words is "six hundred sixty-eight million, six hundred twenty thousand, three hundred twenty".