2623681 has 4 divisors (see below), whose sum is σ = 2679552. Its totient is φ = 2567812.

The previous prime is 2623657. The next prime is 2623711. The reversal of 2623681 is 1863262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2623681 - 2⁹ = 2623169 is a prime.

It is a super-2 number, since 2×2623681² = 13767403979522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2623651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27865 + ... + 27958.

It is an arithmetic number, because the mean of its divisors is an integer number (669888).

2^2623681 is an apocalyptic number.

It is an amenable number.

2623681 is a deficient number, since it is larger than the sum of its proper divisors (55871).

2623681 is an equidigital number, since it uses as much as digits as its factorization.

2623681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55870.

The product of its digits is 3456, while the sum is 28.

The square root of 2623681 is about 1619.7780712184. The cubic root of 2623681 is about 137.9231000529.

The spelling of 2623681 in words is "two million, six hundred twenty-three thousand, six hundred eighty-one".