666731400 has 48 divisors (see below), whose sum is σ = 2066869200. Its totient is φ = 177794880.

The previous prime is 666731399. The next prime is 666731407. The reversal of 666731400 is 4137666.

666731400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666731407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 555010 + ... + 556209.

It is an arithmetic number, because the mean of its divisors is an integer number (43059775).

Almost surely, 2^666731400 is an apocalyptic number.

666731400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666731400 is an abundant number, since it is smaller than the sum of its proper divisors (1400137800).

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

666731400 is a wasteful number, since it uses less digits than its factorization.

666731400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111238 (or 1111229 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 666731400 is about 25821.1424998972. The cubic root of 666731400 is about 873.6087387089.

The spelling of 666731400 in words is "six hundred sixty-six million, seven hundred thirty-one thousand, four hundred".