2551664 has 20 divisors (see below), whose sum is σ = 4995960. Its totient is φ = 1262400.

The previous prime is 2551657. The next prime is 2551687. The reversal of 2551664 is 4661552.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 827 + ... + 2405.

It is an arithmetic number, because the mean of its divisors is an integer number (249798).

2^2551664 is an apocalyptic number.

It is an amenable number.

2551664 is a deficient number, since it is larger than the sum of its proper divisors (2444296).

2551664 is a wasteful number, since it uses less digits than its factorization.

2551664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688 (or 1682 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 2551664 is about 1597.3928759075. The cubic root of 2551664 is about 136.6494313648.

The spelling of 2551664 in words is "two million, five hundred fifty-one thousand, six hundred sixty-four".