1720175625 has 135 divisors (see below), whose sum is σ = 3658095441. Its totient is φ = 776412000.

The previous prime is 1720175599. The next prime is 1720175657. The reversal of 1720175625 is 5265710271.

The square root of 1720175625 is 41475.

It is a perfect power (a square), and thus also a powerful number.

1720175625 is a `hidden beast` number, since 1 + 7 + 20 + 1 + 7 + 5 + 625 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 134861769 + 1585313856 = 11613^2 + 39816^2 .

It is not a de Polignac number, because 1720175625 - 2⁹ = 1720175113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720175625.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 21774336 + ... + 21774414.

Almost surely, 2^1720175625 is an apocalyptic number.

1720175625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1720175625 is the 41475-th square number.

1720175625 is the 20738-th centered octagonal number.

It is an amenable number.

1720175625 is an abundant number, since it is smaller than the sum of its proper divisors (1937919816).

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

1720175625 is an frugal number, since it uses more digits than its factorization.

1720175625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The cubic root of 1720175625 is about 1198.1860614875.

Multiplying 1720175625 by its sum of digits (36), we get a square (61926322500 = 248850²).

Adding to 1720175625 its reverse (5265710271), we get a palindrome (6985885896).

The spelling of 1720175625 in words is "one billion, seven hundred twenty million, one hundred seventy-five thousand, six hundred twenty-five".