667067400 has 120 divisors (see below), whose sum is σ = 2316880170. Its totient is φ = 177880320.

The previous prime is 667067399. The next prime is 667067407. The reversal of 667067400 is 4760766.

It can be written as a sum of positive squares in 3 ways, for example, as 414448164 + 252619236 = 20358^2 + 15894^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×667067400² = 889957832285520000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (667067407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4389 + ... + 36788.

Almost surely, 2^667067400 is an apocalyptic number.

667067400 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 667067400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158440085).

667067400 is an abundant number, since it is smaller than the sum of its proper divisors (1649812770).

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

667067400 is a wasteful number, since it uses less digits than its factorization.

667067400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41205 (or 41187 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 667067400 is about 25827.6479765386. The cubic root of 667067400 is about 873.7554660823.

The spelling of 667067400 in words is "six hundred sixty-seven million, sixty-seven thousand, four hundred".