1605250000 has 70 divisors (see below), whose sum is σ = 3888270542. Its totient is φ = 642000000.

The previous prime is 1605249991. The next prime is 1605250001. The reversal of 1605250000 is 525061.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 1570061376 + 35188624 = 39624^2 + 5932^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1605250000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605250001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 246790 + ... + 253210.

Almost surely, 2^1605250000 is an apocalyptic number.

1605250000 is a gapful number since it is divisible by the number (10) 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 1605250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944135271).

1605250000 is an abundant number, since it is smaller than the sum of its proper divisors (2283020542).

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

1605250000 is an frugal number, since it uses more digits than its factorization.

1605250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459 (or 6428 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1605250000 is about 40065.5712551313. The cubic root of 1605250000 is about 1170.8849564025.

Adding to 1605250000 its reverse (525061), we get a palindrome (1605775061).

The spelling of 1605250000 in words is "one billion, six hundred five million, two hundred fifty thousand".