1687500445 has 4 divisors (see below), whose sum is σ = 2025000540. Its totient is φ = 1350000352.

The previous prime is 1687500433. The next prime is 1687500487. The reversal of 1687500445 is 5440057861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291282489 + 1396217956 = 17067^2 + 37366^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687500445 - 2¹³ = 1687492253 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1687500398 and 1687500407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168750040 + ... + 168750049.

It is an arithmetic number, because the mean of its divisors is an integer number (506250135).

Almost surely, 2^1687500445 is an apocalyptic number.

It is an amenable number.

1687500445 is a deficient number, since it is larger than the sum of its proper divisors (337500095).

1687500445 is an equidigital number, since it uses as much as digits as its factorization.

1687500445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337500094.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 1687500445 is about 41079.1972292546. The cubic root of 1687500445 is about 1190.5508936270.

The spelling of 1687500445 in words is "one billion, six hundred eighty-seven million, five hundred thousand, four hundred forty-five".