668372400 has 360 divisors, whose sum is σ = 2461021056. Its totient is φ = 167731200.

The previous prime is 668372377. The next prime is 668372401. The reversal of 668372400 is 4273866.

It is a tau number, because it is divible by the number of its divisors (360).

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 (668372401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5914744 + ... + 5914856.

Almost surely, 2^668372400 is an apocalyptic number.

668372400 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 668372400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230510528).

668372400 is an abundant number, since it is smaller than the sum of its proper divisors (1792648656).

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

668372400 is a wasteful number, since it uses less digits than its factorization.

668372400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 668372400 is about 25852.8992571433. The cubic root of 668372400 is about 874.3248778707.

The spelling of 668372400 in words is "six hundred sixty-eight million, three hundred seventy-two thousand, four hundred".