625590660 has 72 divisors (see below), whose sum is σ = 1793655360. Its totient is φ = 162915648.

The previous prime is 625590649. The next prime is 625590661. The reversal of 625590660 is 66095526.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625590661) 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 23 ways as a sum of consecutive naturals, for example, 108121 + ... + 113759.

It is an arithmetic number, because the mean of its divisors is an integer number (24911880).

Almost surely, 2^625590660 is an apocalyptic number.

625590660 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 625590660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896827680).

625590660 is an abundant number, since it is smaller than the sum of its proper divisors (1168064700).

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

625590660 is a wasteful number, since it uses less digits than its factorization.

625590660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737 (or 5692 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 625590660 is about 25011.8104102842. The cubic root of 625590660 is about 855.2572257080.

The spelling of 625590660 in words is "six hundred twenty-five million, five hundred ninety thousand, six hundred sixty".