2688987 has 8 divisors (see below), whose sum is σ = 4097536. Its totient is φ = 1536552.

The previous prime is 2688979. The next prime is 2688997. The reversal of 2688987 is 7898862.

It is a happy number.

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

It is not a de Polignac number, because 2688987 - 2³ = 2688979 is a prime.

It is a Duffinian number.

2688987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2688947) 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, 64003 + ... + 64044.

It is an arithmetic number, because the mean of its divisors is an integer number (512192).

2^2688987 is an apocalyptic number.

2688987 is a deficient number, since it is larger than the sum of its proper divisors (1408549).

2688987 is a wasteful number, since it uses less digits than its factorization.

2688987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128057.

The product of its digits is 387072, while the sum is 48.

The square root of 2688987 is about 1639.8130991061. The cubic root of 2688987 is about 139.0580817601.

It can be divided in two parts, 2688 and 987, that multiplied together give a triangular number (2653056 = T₂₃₀₃).

The spelling of 2688987 in words is "two million, six hundred eighty-eight thousand, nine hundred eighty-seven".