2591616 has 64 divisors (see below), whose sum is σ = 7307280. Its totient is φ = 811008.

The previous prime is 2591609. The next prime is 2591623. The reversal of 2591616 is 6161952.

It is an interprime number because it is at equal distance from previous prime (2591609) and next prime (2591623).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6330 + ... + 6726.

2^2591616 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 2591616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3653640).

2591616 is an abundant number, since it is smaller than the sum of its proper divisors (4715664).

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

2591616 is a wasteful number, since it uses less digits than its factorization.

2591616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 419 counting only the distinct ones).

The product of its digits is 3240, while the sum is 30.

The square root of 2591616 is about 1609.8496824238. The cubic root of 2591616 is about 137.3589252796.

It can be divided in two parts, 259161 and 6, that multiplied together give a triangular number (1554966 = T₁₇₆₃).

The spelling of 2591616 in words is "two million, five hundred ninety-one thousand, six hundred sixteen".