668405829 has 32 divisors (see below), whose sum is σ = 1144571904. Its totient is φ = 337233600.

The previous prime is 668405827. The next prime is 668405839. The reversal of 668405829 is 928504866.

It is a happy number.

It is not a de Polignac number, because 668405829 - 2¹ = 668405827 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668405827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46947 + ... + 59504.

It is an arithmetic number, because the mean of its divisors is an integer number (35767872).

Almost surely, 2^668405829 is an apocalyptic number.

668405829 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

668405829 is a deficient number, since it is larger than the sum of its proper divisors (476166075).

668405829 is a wasteful number, since it uses less digits than its factorization.

668405829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106497.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 668405829 is about 25853.5457722920. The cubic root of 668405829 is about 874.3394542351.

The spelling of 668405829 in words is "six hundred sixty-eight million, four hundred five thousand, eight hundred twenty-nine".