1604725745 has 12 divisors (see below), whose sum is σ = 2240066484. Its totient is φ = 1100383200.

The previous prime is 1604725723. The next prime is 1604725753. The reversal of 1604725745 is 5475274061.

It can be written as a sum of positive squares in 2 ways, for example, as 1017099664 + 587626081 = 31892^2 + 24241^2 .

It is not a de Polignac number, because 1604725745 - 2¹⁰ = 1604724721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3274706 + ... + 3275195.

It is an arithmetic number, because the mean of its divisors is an integer number (186672207).

Almost surely, 2^1604725745 is an apocalyptic number.

It is an amenable number.

1604725745 is a deficient number, since it is larger than the sum of its proper divisors (635340739).

1604725745 is an equidigital number, since it uses as much as digits as its factorization.

1604725745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6549920 (or 6549913 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 41.

The square root of 1604725745 is about 40059.0282583090. The cubic root of 1604725745 is about 1170.7574769591.

The spelling of 1604725745 in words is "one billion, six hundred four million, seven hundred twenty-five thousand, seven hundred forty-five".