2687661594 has 128 divisors (see below), whose sum is σ = 6386688000. Its totient is φ = 836305344.

The previous prime is 2687661593. The next prime is 2687661601. The reversal of 2687661594 is 4951667862.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2687661594.

It is not an unprimeable number, because it can be changed into a prime (2687661593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11245327 + ... + 11245565.

It is an arithmetic number, because the mean of its divisors is an integer number (49896000).

Almost surely, 2^2687661594 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2687661594, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3193344000).

2687661594 is an abundant number, since it is smaller than the sum of its proper divisors (3699026406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2687661594 is a wasteful number, since it uses less digits than its factorization.

2687661594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 2687661594 is about 51842.6619108240. The cubic root of 2687661594 is about 1390.3523068812.

The spelling of 2687661594 in words is "two billion, six hundred eighty-seven million, six hundred sixty-one thousand, five hundred ninety-four".