1725649920 has 528 divisors, whose sum is σ = 6616559040. Its totient is φ = 429981696.

The previous prime is 1725649909. The next prime is 1725649931. The reversal of 1725649920 is 299465271.

It is an interprime number because it is at equal distance from previous prime (1725649909) and next prime (1725649931).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23639004 + ... + 23639076.

Almost surely, 2^1725649920 is an apocalyptic number.

1725649920 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 1725649920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3308279520).

1725649920 is an abundant number, since it is smaller than the sum of its proper divisors (4890909120).

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

1725649920 is an equidigital number, since it uses as much as digits as its factorization.

1725649920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1725649920 is about 41540.9426951291. The cubic root of 1725649920 is about 1199.4557532002.

It can be divided in two parts, 17256 and 49920, that added together give a palindrome (67176).

The spelling of 1725649920 in words is "one billion, seven hundred twenty-five million, six hundred forty-nine thousand, nine hundred twenty".