66425400 has 96 divisors (see below), whose sum is σ = 228817200. Its totient is φ = 17712000.

The previous prime is 66425369. The next prime is 66425413. The reversal of 66425400 is 452466.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751 + ... + 11550.

Almost surely, 2^66425400 is an apocalyptic number.

66425400 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 66425400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114408600).

66425400 is an abundant number, since it is smaller than the sum of its proper divisors (162391800).

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

66425400 is a wasteful number, since it uses less digits than its factorization.

66425400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12326 (or 12311 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 66425400 is about 8150.1779121685. The cubic root of 66425400 is about 404.9903975775.

Adding to 66425400 its reverse (452466), we get a palindrome (66877866).

The spelling of 66425400 in words is "sixty-six million, four hundred twenty-five thousand, four hundred".