2644657 has 2 divisors, whose sum is σ = 2644658. Its totient is φ = 2644656.

The previous prime is 2644637. The next prime is 2644669. The reversal of 2644657 is 7564462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 207936 = 1561^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 2644657 - 2¹¹ = 2642609 is a prime.

It is not a weakly prime, because it can be changed into another prime (2644627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322328 + 1322329.

It is an arithmetic number, because the mean of its divisors is an integer number (1322329).

2^2644657 is an apocalyptic number.

It is an amenable number.

2644657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644657 is an equidigital number, since it uses as much as digits as its factorization.

2644657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 2644657 is about 1626.2401421684. The cubic root of 2644657 is about 138.2896841366.

The spelling of 2644657 in words is "two million, six hundred forty-four thousand, six hundred fifty-seven".