2661687 has 16 divisors (see below), whose sum is σ = 4506880. Its totient is φ = 1520856.

The previous prime is 2661661. The next prime is 2661689. The reversal of 2661687 is 7861662.

It is a happy number.

It is not a de Polignac number, because 2661687 - 2¹² = 2657591 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661689) 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, 6853 + ... + 7230.

It is an arithmetic number, because the mean of its divisors is an integer number (281680).

2^2661687 is an apocalyptic number.

2661687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2661687 is a deficient number, since it is larger than the sum of its proper divisors (1845193).

2661687 is a wasteful number, since it uses less digits than its factorization.

2661687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14099 (or 14093 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 2661687 is about 1631.4677440881. The cubic root of 2661687 is about 138.5858833845.

It can be divided in two parts, 266 and 1687, that added together give a triangular number (1953 = T₆₂).

The spelling of 2661687 in words is "two million, six hundred sixty-one thousand, six hundred eighty-seven".