1687772725 has 12 divisors (see below), whose sum is σ = 2098845700. Its totient is φ = 1346342400.

The previous prime is 1687772719. The next prime is 1687772741. The reversal of 1687772725 is 5272777861.

It can be written as a sum of positive squares in 6 ways, for example, as 161620369 + 1526152356 = 12713^2 + 39066^2 .

It is not a de Polignac number, because 1687772725 - 2⁵ = 1687772693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87996 + ... + 105445.

Almost surely, 2^1687772725 is an apocalyptic number.

It is an amenable number.

1687772725 is a deficient number, since it is larger than the sum of its proper divisors (411072975).

1687772725 is a wasteful number, since it uses less digits than its factorization.

1687772725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193800 (or 193795 counting only the distinct ones).

The product of its digits is 2304960, while the sum is 52.

The square root of 1687772725 is about 41082.5111817669. The cubic root of 1687772725 is about 1190.6149224031.

The spelling of 1687772725 in words is "one billion, six hundred eighty-seven million, seven hundred seventy-two thousand, seven hundred twenty-five".