666725400 has 288 divisors, whose sum is σ = 2469841920. Its totient is φ = 159840000.

The previous prime is 666725359. The next prime is 666725413. The reversal of 666725400 is 4527666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2989689 + ... + 2989911.

It is an arithmetic number, because the mean of its divisors is an integer number (8575840).

Almost surely, 2^666725400 is an apocalyptic number.

666725400 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 666725400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234920960).

666725400 is an abundant number, since it is smaller than the sum of its proper divisors (1803116520).

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

666725400 is a wasteful number, since it uses less digits than its factorization.

666725400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 666725400 is about 25821.0263157761. The cubic root of 666725400 is about 873.6061181293.

The spelling of 666725400 in words is "six hundred sixty-six million, seven hundred twenty-five thousand, four hundred".