2545668 has 54 divisors (see below), whose sum is σ = 6750926. Its totient is φ = 839808.

The previous prime is 2545657. The next prime is 2545679. The reversal of 2545668 is 8665452.

It is an interprime number because it is at equal distance from previous prime (2545657) and next prime (2545679).

It can be written as a sum of positive squares in only one way, i.e., 2125764 + 419904 = 1458^2 + 648^2 .

It is a tau number, because it is divible by the number of its divisors (54).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26196 + ... + 26292.

2^2545668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2545668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3375463).

2545668 is an abundant number, since it is smaller than the sum of its proper divisors (4205258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2545668 is an frugal number, since it uses more digits than its factorization.

2545668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 102 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 2545668 is about 1595.5149638910. The cubic root of 2545668 is about 136.5423126885.

The spelling of 2545668 in words is "two million, five hundred forty-five thousand, six hundred sixty-eight".