2561672 has 8 divisors (see below), whose sum is σ = 4803150. Its totient is φ = 1280832.

The previous prime is 2561659. The next prime is 2561681. The reversal of 2561672 is 2761652.

It can be written as a sum of positive squares in only one way, i.e., 1811716 + 749956 = 1346^2 + 866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160097 + ... + 160112.

2^2561672 is an apocalyptic number.

It is an amenable number.

2561672 is a deficient number, since it is larger than the sum of its proper divisors (2241478).

2561672 is a wasteful number, since it uses less digits than its factorization.

2561672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320215 (or 320211 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 2561672 is about 1600.5224147134. The cubic root of 2561672 is about 136.8278513338.

The spelling of 2561672 in words is "two million, five hundred sixty-one thousand, six hundred seventy-two".