666733400 has 48 divisors (see below), whose sum is σ = 1553937000. Its totient is φ = 266042880.

The previous prime is 666733393. The next prime is 666733409. The reversal of 666733400 is 4337666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666733409) 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 11 ways as a sum of consecutive naturals, for example, 82751 + ... + 90449.

Almost surely, 2^666733400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666733400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776968500).

666733400 is an abundant number, since it is smaller than the sum of its proper divisors (887203600).

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

666733400 is a wasteful number, since it uses less digits than its factorization.

666733400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8148 (or 8139 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 35.

The square root of 666733400 is about 25821.1812278215. The cubic root of 666733400 is about 873.6096122319.

The spelling of 666733400 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, four hundred".