668854590 has 32 divisors (see below), whose sum is σ = 1608369696. Its totient is φ = 178014720.

The previous prime is 668854583. The next prime is 668854591. The reversal of 668854590 is 95458866.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668854591) 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, 5767 + ... + 37026.

It is an arithmetic number, because the mean of its divisors is an integer number (50261553).

Almost surely, 2^668854590 is an apocalyptic number.

668854590 is an abundant number, since it is smaller than the sum of its proper divisors (939515106).

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

668854590 is a wasteful number, since it uses less digits than its factorization.

668854590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43324.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 668854590 is about 25862.2232222986. The cubic root of 668854590 is about 874.5350847202.

The spelling of 668854590 in words is "six hundred sixty-eight million, eight hundred fifty-four thousand, five hundred ninety".