655625000 has 64 divisors (see below), whose sum is σ = 1538082000. Its totient is φ = 262000000.

The previous prime is 655624987. The next prime is 655625021. The reversal of 655625000 is 526556.

It can be written as a sum of positive squares in 8 ways, for example, as 490091044 + 165533956 = 22138^2 + 12866^2 .

It is a sliding number, since 655625000 = 15625000 + 640000000 and 1/15625000 + 1/640000000 = 0.0000000655625000.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 624476 + ... + 625524.

Almost surely, 2^655625000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655625000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (769041000).

655625000 is an abundant number, since it is smaller than the sum of its proper divisors (882457000).

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

655625000 is an frugal number, since it uses more digits than its factorization.

655625000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 655625000 is about 25605.1752581387. The cubic root of 655625000 is about 868.7306984653.

The spelling of 655625000 in words is "six hundred fifty-five million, six hundred twenty-five thousand".