667040400 has 240 divisors, whose sum is σ = 2557336320. Its totient is φ = 164160000.

The previous prime is 667040393. The next prime is 667040417. The reversal of 667040400 is 4040766.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138025 + ... + 142775.

It is an arithmetic number, because the mean of its divisors is an integer number (10655568).

Almost surely, 2^667040400 is an apocalyptic number.

667040400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667040400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278668160).

667040400 is an abundant number, since it is smaller than the sum of its proper divisors (1890295920).

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

667040400 is a wasteful number, since it uses less digits than its factorization.

667040400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4791 (or 4774 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 667040400 is about 25827.1252755703. The cubic root of 667040400 is about 873.7436773106.

The spelling of 667040400 in words is "six hundred sixty-seven million, forty thousand, four hundred".