1687225705 has 16 divisors (see below), whose sum is σ = 2230607808. Its totient is φ = 1214920000.

The previous prime is 1687225703. The next prime is 1687225723. The reversal of 1687225705 is 5075227861.

It is not a de Polignac number, because 1687225705 - 2¹ = 1687225703 is a prime.

It is a super-2 number, since 2×1687225705² = 5693461159225494050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1687225703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146311 + ... + 157420.

It is an arithmetic number, because the mean of its divisors is an integer number (139412988).

Almost surely, 2^1687225705 is an apocalyptic number.

It is an amenable number.

1687225705 is a deficient number, since it is larger than the sum of its proper divisors (543382103).

1687225705 is a wasteful number, since it uses less digits than its factorization.

1687225705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303848.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 1687225705 is about 41075.8530647873. The cubic root of 1687225705 is about 1190.4862793813.

The spelling of 1687225705 in words is "one billion, six hundred eighty-seven million, two hundred twenty-five thousand, seven hundred five".