2687631 has 8 divisors (see below), whose sum is σ = 3593520. Its totient is φ = 1786752.

The previous prime is 2687621. The next prime is 2687639. The reversal of 2687631 is 1367862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2687631 - 2⁶ = 2687567 is a prime.

It is a super-2 number, since 2×2687631² = 14446720784322, which contains 22 as substring.

2687631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2687592 and 2687601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2687639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (449190).

2^2687631 is an apocalyptic number.

2687631 is a deficient number, since it is larger than the sum of its proper divisors (905889).

2687631 is a wasteful number, since it uses less digits than its factorization.

2687631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505.

The product of its digits is 12096, while the sum is 33.

The square root of 2687631 is about 1639.3995852141. The cubic root of 2687631 is about 139.0347031341.

The spelling of 2687631 in words is "two million, six hundred eighty-seven thousand, six hundred thirty-one".