625440 has 48 divisors (see below), whose sum is σ = 1971648. Its totient is φ = 166656.

The previous prime is 625409. The next prime is 625451. The reversal of 625440 is 44526.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 625440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 1131.

It is an arithmetic number, because the mean of its divisors is an integer number (41076).

2⁶²⁵⁴⁴⁰ is an apocalyptic number.

625440 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 625440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985824).

625440 is an abundant number, since it is smaller than the sum of its proper divisors (1346208).

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

625440 is a wasteful number, since it uses less digits than its factorization.

625440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321 (or 1313 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 625440 is about 790.8476465161. The cubic root of 625440 is about 85.5188563452.

Adding to 625440 its reverse (44526), we get a palindrome (669966).

The spelling of 625440 in words is "six hundred twenty-five thousand, four hundred forty".