666029838 has 48 divisors (see below), whose sum is σ = 1438753536. Its totient is φ = 205405200.

The previous prime is 666029831. The next prime is 666029869. The reversal of 666029838 is 838920666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666029831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89563 + ... + 96713.

It is an arithmetic number, because the mean of its divisors is an integer number (29974032).

Almost surely, 2^666029838 is an apocalyptic number.

666029838 is an abundant number, since it is smaller than the sum of its proper divisors (772723698).

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

666029838 is a wasteful number, since it uses less digits than its factorization.

666029838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7237 (or 7218 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 666029838 is about 25807.5538941605. The cubic root of 666029838 is about 873.3022155777.

The spelling of 666029838 in words is "six hundred sixty-six million, twenty-nine thousand, eight hundred thirty-eight".