1687227861 has 32 divisors (see below), whose sum is σ = 2525328000. Its totient is φ = 993012480.

The previous prime is 1687227823. The next prime is 1687227863.

1687227861 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1687227861 - 2⁷ = 1687227733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1687227861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687227863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 864715 + ... + 866663.

It is an arithmetic number, because the mean of its divisors is an integer number (78916500).

Almost surely, 2^1687227861 is an apocalyptic number.

1687227861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1687227861 is a deficient number, since it is larger than the sum of its proper divisors (838100139).

1687227861 is a wasteful number, since it uses less digits than its factorization.

1687227861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709.

The product of its digits is 451584, while the sum is 48.

The square root of 1687227861 is about 41075.8793089083. The cubic root of 1687227861 is about 1190.4867864637.

The spelling of 1687227861 in words is "one billion, six hundred eighty-seven million, two hundred twenty-seven thousand, eight hundred sixty-one".