2581672 has 8 divisors (see below), whose sum is σ = 4840650. Its totient is φ = 1290832.

The previous prime is 2581669. The next prime is 2581673. The reversal of 2581672 is 2761852.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 715716 = 1366^2 + 846^2 .

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 not an unprimeable number, because it can be changed into a prime (2581673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161347 + ... + 161362.

2^2581672 is an apocalyptic number.

It is an amenable number.

2581672 is a deficient number, since it is larger than the sum of its proper divisors (2258978).

2581672 is a wasteful number, since it uses less digits than its factorization.

2581672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322715 (or 322711 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 2581672 is about 1606.7582269900. The cubic root of 2581672 is about 137.1830185784.

The spelling of 2581672 in words is "two million, five hundred eighty-one thousand, six hundred seventy-two".